Thumbs-up Definition

thŭmbzŭp
noun
An act, instance, or sign of approval.
American Heritage

A gesture signifying approval or okay; a thumb pointing up out of a fist.

He smiled and gave a big thumbs up.
Wiktionary

Origin of Thumbs-up

  • With reference to the signal of approval or disapproval used by spectators at a Roman amphitheatre, but sense has been reversed.

    From Wiktionary

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