What does uh mean?
“Uh” is an informal English interjection used when a speaker needs time to think, is unsure how to continue, or wants to draw another person’s attention before speaking. In a sentence such as “Uh, I’m not sure,” it marks hesitation and uncertainty; used at the start of a conversation, it can function like “hey” or “excuse me.” The word belongs to a familiar set of vocal hesitation devices, including “um,” “erm,” and “ah,” although each can convey slightly different degrees of pause, uncertainty, or realization. Because “uh” often communicates an unplanned moment in speech, it is uncommon in careful formal writing, where it can sound uncertain, hesitant, or even careless. In informal conversation, however, it is useful precisely because it makes a speaker’s thought process audible and natural. It is especially associated with English as spoken in the United States and Britain, though similar fillers occur across many languages.
interjectionAn interjection used to express hesitation or uncertainty, or to get another person's attention before speaking.
- A hesitation or uncertainty marker used while a speaker pauses, thinks, or searches for words.
- An attention-getter used to begin a statement or indicate that the speaker wishes another person to notice or listen.
"Uh, I wasn't expecting the question."
"Uh, I think I left my keys at home."
"Uh, can everyone hear me?"
Sometimes the most honest word in a conversation is the one that admits the speaker has not quite found their words yet.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does uh come from?
The origin of the interjection is uncertain. It is generally treated as a vocal hesitation sound rather than a word with a traceable root, and its use developed alongside related fillers such as “um” and “ah.” Those forms are analogues in function, not necessarily established cognates.
How uh is actually used
This is an informal spoken filler and is normally avoided in formal writing. It can make a speaker sound uncertain, unprepared, or disengaged, although in relaxed conversation it often simply marks a natural pause. Similar forms such as "um," "erm," and "er" vary in sound and regional usage.
Easily confused with uh
Both are hesitation fillers, but "uh" can also serve as an attention-getter, whereas "um" primarily marks a pause while thinking.
"Uh" usually signals uncertainty or a need for time, while "ah" can convey realization, surprise, or acknowledgment.