noun Informal.
an act, instance, or gesture of assent, approval, or the like.

1920–25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
He scrunched up his face, thrust his arms above his head, and gave the double
  thumbs-up sign.
They smiled, nodded, and gave the locals a thumbs-up sign.
Big bands, a ceremonial guard, thousands of people making thumbs-up signs along
Rather than using a simple thumbs-up or thumbs-down, users can rate people at
  six levels of trustworthiness.
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