• lock the stable door after the horse has bolted

• bolt upright

• bold on like grim death

• as bold as brass

• not to have a snowball's chance in hell

• have the ball in one's court

• play ball

• have a ball

• keep the ball rolling

• a bolt from the blue

• take me out to the ballgame

• on the ball

• the nuts and bolts

• eyeball to eyeball

• nuts and bolts

• an oddball

• bowl over