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lever (n.)

"simple machine consisting of a rigid piece acted upon at different points by two forces," c. 1300, from Old French levier (12c.) "a lifter, a lever, crowbar," agent noun from lever "to raise" (10c.), from Latin levare "to raise," from levis "light" in weight, "not heavy," also, of motion, "quick, rapid, nimble;" of food, "easy to digest;" figuratively "slight, trifling, unimportant; fickle, inconsistent;" of punishments, etc., "not severe," from PIE root *legwh- "not heavy, having little weight." As a verb, 1856, from the noun.

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Definitions of lever
1
lever (n.)
a rigid bar pivoted about a fulcrum;
lever (n.)
a simple machine that gives a mechanical advantage when given a fulcrum;
lever (n.)
a flat metal tumbler in a lever lock;
Synonyms: lever tumbler
2
lever (v.)
to move or force, especially in an effort to get something open;
Synonyms: pry / prise / prize / jimmy
From wordnet.princeton.edu