(noun, verb, interjection)


1. A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly.

2. A word used ironically in a situation where one might have scared someone, but said someone was not scared. Not said as loudly as in definition 1.

3. An exclamation used by a member or many members of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred.


1. a cry or noise made to express displeasure or contempt

Similar word(s): bird, hiss, hoot, raspberry, razz, razzing, snort

Definition categories: communication, call, cry, outcry, shout, vociferation, yell


1. show displeasure, as after a performance or speech

Similar word(s): hiss

Definition categories: communication, condemn

Sentences with boo as a verb:

- When he took the podium, the crowd booed.

- The protesters loudly booed the visiting senator.