hold with the hare and run with the hounds

apron-string hold

An estate held by a man during his wife's life.

break into a run

To start running.

buy and hold

A passive investment strategy where an investor purchases an asset and retains it for many years, rather than trading it frequently.

common run

Ordinary persons, things, or events.

don't hold your breath

Don't wait. Said cynically to suggest that what has just been mentioned is unlikely to happen soon or at all.

dry run

A practice or rehearsal; especially, one that goes through all the motions of a physical process but without the raw material or workpiece present.

dummy run

A trial or practice before the real attempt.

good run

Success over an extended period.