[ boo ]
See synonyms for: boobooing on

  1. (used to express contempt or disapprobation or to startle or frighten.)

noun,plural boos.
  1. an exclamation of contempt or disapproval: a loud boo from the bleachers.

verb (used without object),booed, boo·ing.
  1. to cry boo in derision.

verb (used with object),booed, boo·ing.
  1. to show disapproval of by booing.

Origin of boo

First recorded in 1630–40; expressive formation

Words Nearby boo

Other definitions for boo (2 of 3)

[ boo, boh ]

  1. Slang. marijuana.

Origin of boo

First recorded in 1955–60; of uncertain origin
  • Also called boo grass.

Other definitions for boo (3 of 3)

[ boo ]

  1. one's boyfriend or girlfriend.

Origin of boo

1985–90; of uncertain origin; possibly an alteration of French beau “boyfriend, admirer” Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use boo in a sentence

British Dictionary definitions for boo


/ (buː) /

  1. an exclamation uttered to startle or surprise someone, esp a child

  2. a shout uttered to express disgust, dissatisfaction, or contempt, esp at a theatrical production, political meeting, etc

  1. would not say boo to a goose is extremely timid or diffident

verbboos, booing or booed
  1. to shout "boo" at (someone or something), esp as an expression of disgust, dissatisfaction, or disapproval: to boo the actors

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012