lever
n. countable B2 Upper Intermediate US //ˈɫɛvɝ// UK //lˈiːvɐ// lever
n. a long bar or handle that you push or pull to control a machine or lift something heavy. It makes it easier to move things by using a fixed point for support.
n. a rigid bar resting on a pivot, used to help move a heavy or fixed load with one end when pressure is applied to the other. Also refers to a handle used to operate a mechanism.
Pull the lever to start the machine.
The mechanic used a long metal lever to pry the rusted wheel off the axle.
Archimedes famously claimed that with a long enough lever and a place to stand, he could move the entire world.
Usage
Commonly used with verbs like 'pull', 'push', or 'operate'.