Cases of word usage

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

2) a point on which a lever turns (fulcrum)

3) a fastening for a door or gate, with a bar falling into a catch and being lifted by a small lever (latch)

4) a lever on a bicycle, sewing machine etc worked by the foot or feet (pedal)

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

6) a lever used for releasing a spring, especially of a gun; to be the immediate cause of something serious or violent (trigger)