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English definition of “thumb”

thumb

noun [C] uk   /θʌm/ us  

thumb

verb uk   /θʌm/ us  
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. 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.
Phrasal verbs
(Definition of thumb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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