piston

Plural: pistons

Noun

• A moving part in an engine or pump.
• United States neoclassical composer (1894-1976)
• mechanical device that has a plunging or thrusting motion
• A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
• A valve device in some brass instruments for changing the pitch

Verb

• To move up and down or in and out like a piston.

Examples

• He worked his letters like a PISTON, pushing forward for a high score in Words With Friends.

Synonyms

plunger, Walter Piston