Longman Dictionary of Contemporary English homepage

rub

2 noun
     
rub2
1

give somebody/something a rub

to rub something or massage someone for a short time:
Give the table a good rub with a damp cloth.
2

there's/here's the rub

literary used when saying that a particular problem is the reason why a situation is so difficult - often used humorously
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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