Not everyone says “um,” but hesitation sounds occur across many languages. English has “uh” and “um,” French has “euh,” and Japanese has forms such as “ēto” and “ano.” These little sounds can buy thinking time, signal a delay, and help listeners follow what comes next.
Imagine someone asks you to name the actor in that movie—the one with the boat, not that boat, the other boat.
“Um…”
Before you have retrieved a single useful name, you have already produced something linguistically interesting. Your hesitation is not necessarily empty noise. It belongs to a surprisingly varied part of language: the sounds people make while their next words are still under construction.
What Exactly Is a Filled Pause?
Linguists call sounds such as “uh” and “um” filled pauses. Instead of stopping silently, a speaker fills a break with a vocalization. These belong to the broader family of speech disfluencies, which also includes repetitions, abandoned phrases, and other interruptions to smooth delivery.
Compare these invented examples:
- Silent pause: “I left the keys on the … windowsill.”
- Filled pause: “I left the keys on the, um, windowsill.”
- Repetition: “I left the—the keys on the windowsill.”
- Self-correction: “I left them on the table—sorry, the windowsill.”
All involve a little conversational repair or delay. Only the second contains the classic hesitation sound we are investigating.
But “filled pause” and “filler word” are not perfectly interchangeable labels. Expressions such as “well,” “you know,” and “I mean” can organize conversation or clarify how a statement should be understood. Lumping every small conversational expression into the “meaningless filler” basket hides those differences.
Even the status of “um” is debated: some researchers treat it as a conventional word, while others describe filled pauses differently. Tiny sound, substantial academic discussion.
A Quick Tour of the World’s Hesitations
The world does not share one standardized hesitation soundtrack. Here are several well-documented examples—not complete inventories, and certainly not rules for every speaker.
| Language | Some hesitation forms | What to notice | |---|---|---| | English | uh, um; er, erm | Written forms vary, including between American and British conventions. | | French | euh, euhm | Similar-looking spellings do not mean identical pronunciation across languages. | | German | äh, ähm | A vowel-only form contrasts with one ending in m. | | Dutch | eh, ehm; uh, uhm | Again, both vowel-only and vowel-plus-m forms occur. | | Spanish | eh, em | These are among the forms documented in research on Spanish speakers. | | Japanese | ēto, ano | Hesitation forms can extend beyond the short vowel patterns familiar from English. |
These examples draw on cross-linguistic research and studies of individual languages.
A useful pattern emerges: many languages use both a vowel-like hesitation and a version with a nasal ending, commonly m. English “uh/um,” German “äh/ähm,” and Dutch “eh/ehm” are recognizable relatives in shape, even though their precise sounds and usage differ.
Japanese shows why the English template cannot explain everything. Its repertoire includes longer forms, and research comparing English, Chinese, and Japanese found that hesitation choices can distinguish different kinds of speaking problems or interaction with a listener. A one-to-one “foreign word for um” translation can therefore miss important details.
Why “Um” Is More Than an Empty Sound
Speaking requires planning, and a filled pause can appear when that planning needs extra time—for example, before a difficult-to-retrieve word or information that has not yet entered the conversation. Meanwhile, listeners can use the hesitation as a clue.
Consider:
“The restaurant is beside the, um, conservatory.”
The pause gives the speaker time to find “conservatory.” For the listener, it may also flag that the upcoming word is less immediately accessible than something routine like “road.” The sound does not identify the building, but it can help explain the delay.
Filled pauses can also help manage conversational turns. An “um…” may indicate that the speaker is still working on an answer rather than inviting someone else to take over. Researchers have documented roles in holding the floor, coordinating turn-taking, and marking boundaries in speech.
That is an important distinction: a sound can carry conversational information without naming a thing or describing an action.
For a related perspective, explore the secret meanings of silence across cultures. A filled pause and an unfilled pause are different choices, but both invite us to pay attention to the spaces between words.
Do “Uh” and “Um” Mean Different Things?
Sometimes—but beware of turning a research finding into an unbreakable rule.
In their influential study of “uh” and “um” in spontaneous speech, psychologists Herbert H. Clark and Jean E. Fox Tree proposed that speakers use “uh” to announce an expected minor delay and “um” an expected major delay.
Think of the proposed contrast as “one moment” versus “this may take a moment longer,” rather than two dictionary definitions.
However, later cross-linguistic research found that this distinction did not work identically across English varieties. In that study, British—but not American—English speakers used “um” to signal a more severe speaking problem than “uh.” Other languages organized their hesitation choices along different dimensions.
So an individual “um” is not a stopwatch, and an “uh” is not a guarantee that the next word will arrive promptly.
There is another open question: how much of this signaling is deliberately aimed at a listener, and how much is information listeners extract from the speaker’s planning process? Researchers continue to investigate that distinction. “Useful to hear” does not necessarily mean “consciously selected to help you.”
Even Toddlers Can Notice the Clues
Adults are not the only listeners who can make use of hesitation.
In a 2011 eye-tracking study of toddlers, researchers tested whether children could use disfluent speech to anticipate what a speaker would name. Children aged roughly two years and four months to two years and eight months showed a reliable tendency to look toward an unfamiliar object after hearing a hesitation cue, before its label arrived.
The important point is not that “um” magically teaches vocabulary. It is that children can notice patterns connecting hesitation with what speakers are likely to mention next.
That is quite an achievement for a sound adults are often told to eliminate.
Can Hesitation Sounds Cross Language Borders?
Yes. The boundaries between languages can be porous even in these tiny conversational details.
A study of 80 Spanish-speaking Boston residents found differences associated with their language backgrounds. Participants who arrived in the United States as adults and used Spanish exclusively with most interlocutors strongly preferred eh/em. Those born in the United States or arriving as children, and/or using exclusively Spanish with fewer interlocutors, were more likely to use ah/am and English-like uh/um.
The researchers interpreted these patterns as evidence consistent with language contact influencing pause-filling habits—not as proof that every bilingual follows the same trajectory. Their report on Spanish conversational pause-fillers offers a fascinating look at language change on a very small scale.
It is a useful companion to thinking about language, identity, and how we shift our speech depending on who is listening.
Listen to the Hesitation, Not Just the Words
Want to investigate this yourself? Try a small listening exercise with an unscripted interview or a casual conversation:
- Notice the form. Is it a vowel, a hum, or a longer expression?
- Notice the location. Does it come before a name, an explanation, or a correction?
- Notice the response. Does the other person wait, offer a word, or begin speaking?
Treat your observations as questions, not instant diagnoses. One hesitation cannot reveal someone’s intelligence, personality, or entire cultural background.
The answer to our opening question is therefore a cheerful “not exactly.” Many languages have familiar ways to hesitate, but they do not all sound alike or divide up the conversational work in the same way.
The next time you say “um,” there is no need to celebrate every syllable—or apologize for being human. Sometimes the words simply need another second to arrive.