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English definition of “thumb”

thumb

noun [C]
 
 
/θʌm/
get/be given the thumbs down informal if an idea, project, etc. gets the thumbs down, it is not approved: The proposal was given the thumbs down at the board meeting.
get/be given the thumbs up informal to be approved: The controversial merger got the thumbs up from investors.
(Definition of thumb from the Cambridge Business English Dictionary © Cambridge University Press)
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