- 1 a 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.
- 2people shout Boo! when they want to surprise or frighten someone Idioms
- 1to be very shy or gentle
- 2 to not say anything at all Walter looked at us, but he didn't say boo.
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