There are 2 main definitions of boo in English:

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boo1

Line breaks: boo
Pronunciation: /buː
 
/

exclamation

1Said suddenly to surprise someone who is unaware of one’s presence: ‘Boo!’ she cried, jumping up to frighten him
[probably an alteration of earlier bo, used in the same way since late Middle English]
More example sentences
  • Behind the church, right at the back of the graveyard (a graveyard I used to have to walk past in the dark with a sadistic little sister who thought it funny to say boo) is a tiny ruin.
  • I kept looking at them, waiting for a face to appear, to say hi or boo.
  • Ethan looked kind of nervous, I had the sudden urge to jump up and scream boo just to see what he'd do.
2Said to show disapproval or contempt: ‘There’s only one bar.’ ‘Boo!’
More example sentences
  • Unfortunately, one of the curtain rod kits I'd bought didn't have the mounting hardware inside, so I'm going to have to get another one - boo!
  • I have to get the whole broken on-off button on my cell phone seen to or else buy a new phone - boo!
  • Bianca gets every day except Tuesday off coz she's doing her IT subjects via distance. boo!

noun

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An utterance of ‘boo’ to show disapproval of a speaker or performer: the audience greeted this comment with boos and hisses
More example sentences
  • As Moore shouted over boos and cheers, most of the nominees who had just given him a standing ovation sat silent.
  • As the march swung past Number 10 there was a cacophony of whistles, boos, jeers and insults.
  • Shouts, boos, whistles from the crowd sheltering in the marquees.

verb (boos, booing, booed)

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Say ‘boo’ to show disapproval of a speaker or performer: [no object]: they booed and hissed when he stepped on stage [with object]: the team were booed off the pitch
More example sentences
  • Angry crowds attended public meetings organised by the Commission, jeering and booing the speakers.
  • Before he could finish, the crowd showed their disapproval by booing him off the stage.
  • Raymond actually booed when they disappeared off the right edge of the monitor.

Origin

early 19th century (in sense 2 of the exclamation): imitative of the lowing of oxen.

Phrases

wouldn't say boo to a goose

1
Used to emphasize that someone is very timid: he seemed the kind of chap who wouldn’t say boo to a goose
More example sentences
  • My youngest son wouldn't say boo to a goose and he was absolutely petrified.
  • It turns out that the lad who looks like a no-nonsense squaddie on the park wouldn't say boo to a goose outwith those environs.
  • ‘He was quite a quiet guy who kept himself to himself - you always got the impression he wouldn't say boo to a goose,’ said Mr Hemmings.

Definition of boo in:

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There are 2 main definitions of boo in English:

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boo2

Line breaks: boo
Pronunciation: /buː
 
/

noun

US informal
A person’s boyfriend or girlfriend.
Example sentences
  • Some things I view as sacred and extremely personal that I wouldn't share… these include times shared with my boo.
  • ‘I'm not doubting what happened, boo,’ Shayna began sweetly.
  • She has also made solo inroads, doing that song about being with her boo.

Origin

1980s: origin uncertain; probably an alteration of French beau 'boyfriend, male admirer'.

Definition of boo in:

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