Usage examples for rub:

• Aye, there's the rub "The Sea-Hawk" – Raphael Sabatini

• Were I in our Lord's place, he thought, then put in another rub or two and beg again: Were I in our Lord's place, I'd see to it that a thing was done the instant your mind was made up. "Jerusalem" – Selma Lagerlöf

• " Perhaps if you will let me rub the little back-" " O, I can't bear to have a doctor touch it!" "Heart of Gold" – Ruth Alberta Brown

• Guess how near a thing it seemed to them, when I tell you they dared not rub him. "A Simpleton" – Charles Reade