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1. A support used by an injured or disabled person, often in pairs, as an aid to walking, having a vertical shaft that is sometimes forked, a horizontal grip for the hand, and a crosspiece that is positioned under the armpit or a cuff that wraps around the forearm.
2. Something on which one depends, often excessively: a mnemonic crutch.
3. A forked support or part.
4. A forked leg rest on a sidesaddle.
5. Archaic The crotch of a person or animal.
v. crutched, crutch·ing, crutch·es
To move using a crutch or crutches.
To support on a crutch or crutches.

[Middle English crucche, from Old English crycc.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.