give the thumbs down

give something the thumbs down

to show that you do not like or approve of something, or that you will not allow something to happen The committee gave my suggestion the thumbs down.
See also: down, give, thumb
References in periodicals archive ?
And if, as green campaigners hope, they give the thumbs down, their decision could open the way for a GM crop ban throughout Britain.
And Labour MPs are set to give the thumbs down to Mr Blair's tough leadership style by snubbing two of his key allies.