- 1a sound that people make to show that they do not like an actor, speaker, etc. “Boo!” they shouted. “Get off the stage!” The speech was greeted with loud boos from the audience.
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- 2people shout Boo! when they want to surprise or frighten someone
- 1to be very shy or gentle
- 2to not say anything at all Walter looked at us, but he didn't say boo.
Check pronunciation: boo