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English definition of “thumb”

thumb

verb     /θʌm/
thumb a lift informal to stand near the edge of a road and hold out your hand with the thumb raised as a signal for a vehicle to stop and take you somewhere: We thumbed a lift to London.Journeys thumb your nose at sb/sth to show no respect, or to raise the end of your thumb to the end of your nose to show that you do not respect someone: He has thumbed his nose at authority all his life.Showing arrogance and conceitConfidence and self-assuranceBoasting
(Definition of thumb verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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