boo

Universal Words exclamation, noun, verb exclamation, noun 1 a sound that people make to show that they do not like an actor, speaker, etc: 'Boo!' they shouted, 'Get off!'. * The speech was greeted with loud boos from the audience. 2 people shout Boo! when they want to surprise or frighten sb IDIOMS see SAYv. verb to show that you do not like a person, performance, idea, etc. by shouting 'boo': [V] The audience booed as she started her speech. * [VN] He was booed off the stage.