a straight, iron bar, often with a forked end, used as a lever for moving heavy objects

iron lever

a lever on a bicycle, sewing machine etc worked by the foot or feet

machine

(to use) a pedal or lever that drives a machine (e.g. a sewing-machine) worked by pressure of the foot or feet

machine

to take the cork from (a bottle)

clear, expose; spread

to use a key to open a lock on (a door, cupboard etc)

open; solve