lever

Definition

A rigid piece which is capable of turning about one point, or axis (fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion.

Etymology

From Middle English lever, levore, levour, from Old French leveor, leveur (“a lifter, lever (also Old French and French levier)”), from Latin levātor (“a lifter”), from levō (“to raise”). Doublet of levator.

Example Sentences

• "Retractable steps and handrails are provided on each side of the cars. The steps, which are under the control of the guard, are operated by hand levers in the entrance vestibule."
• "A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place."
• "My lord, I brained him with a lever my neighbour lent me, and he stood by and cried, ‘Strike home, old boy!’"

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