noun
the action of moving one's hand or an object back and forth against a surface
verb
present participle of the verb 'rub', which means to move one's hand or an object back and forth against a surface
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The physical therapist showed the patient the proper technique for rubbing the sore muscles.
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I always feel better after rubbing my temples when I have a headache.
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She's always rubbing it in that she got the promotion over me.
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The success of the team was like rubbing salt in the wound for their rivals.