Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Natural sound

boo

2 interjection
     
boo2
1 a noise made by people who do not like a person, performance, idea etc
2 a word you shout suddenly to someone as a joke in order to frighten them
3

wouldn't say boo to a goose

an expression used to describe a shy quiet person
Definition from the Longman Dictionary of Contemporary English
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