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English definition of “rub”

rub

verb [I/T]  /rʌb/ (-bb-) us  
to press or be pressed against something with a repeated circular, side to side, or up and down movement: [T] I rubbed the place where I bumped my head. [T] If you rub linseed oil into the wood, it will protect it.

rub

noun [C]  /rʌb/ us  
The rub is something that prevents success: She got good reviews for her original cooking, but the rub was that people wanted very traditional dishes.
(Definition of rub from the Cambridge Academic Content Dictionary © Cambridge University Press)
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