noun
A short, thick digit of the hand that is set lower and apart from the other four and opposable to them.
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She accidentally hit her thumb with a hammer while working on the construction site.
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Ouch! I just smashed my thumb with the door!
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I can't believe I hitchhiked all the way here with just my thumb!
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The new policy is a thumbs up from the employees, they are happy with the changes.