The initial idioms of the letter R

run to earth	run to form
run to ground	run to seed
run up	run up against
run up the flagpole	run up to some place
run with it	run with
run with the hare and hunt with the hounds	runaround
rundown	rung
runner	running
running high	running on empty
running on fumes	running start
run-of-the-mill	runt of the litter
runt	run-up
rush	rush at
rush for	rush in
rush into	rush into print