Definition of mm exclamation from the Oxford Advanced Learner's Dictionary

 

mm

 exclamation
exclamation
BrE
 
; NAmE
 
 
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(also mmm) the way of writing the sound /m/ that people make to show that they are listening to somebody or that they agree, they are thinking, they like something, they are not sure, etc. Mm, I know what you mean. Mm, what lovely cake! Mmm, I'm not so sure that's a good idea. More Like This Exclamations aargh, ah, aha, ahchoo, ahem, aw, bah, boo, coo, d’oh, eek, eh, er, eww, gee, ha, hey, ho ho, ho-hum, hooray, huh, mm, oh, oho, oi, ooh, oops, ouch, ow, oy, pah, phew, psst, sh, tsk tsk, tut, ugh, uh, uh-uh, uh-oh, um, whoopee, whoops, woo hoo, wow, yay, yippee, yuck, yumSee worksheet.
See the Oxford Advanced American Dictionary entry: mm