Definition of uh-oh exclamation from the Oxford Advanced Learner's Dictionary

 

uh-oh

 exclamation
exclamation
BrE
 
; NAmE
 
(also oh-oh)
 
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the way of writing the sound that people make when they want to say that they have done something wrong or that they think there will be trouble Uh-oh. I forgot to write that letter. Uh-oh! Turn the TV off. Here comes Dad! 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: uh-oh