The initial idioms of the letter R

RTFM	rub
rub against	rub at
rub away	rub down
rub elbows	rub elbows with
rub hands	rub in
rub into	rub it in
rub nose in	rub nose in it
rub off	rub off on
rub one's hands	rub out
rub over	rub salt in a wound
rub salt in the wound	rub salt into wounds
rub shoulders with	rub someone’s nose in something
rub someone out	rub someone's nose in it
rub the wrong way	rub together
rub up	rub up on