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back clearance

 - 2 dictionary results

run⋅out

[ruhn-out]
–noun
1. Machinery.
a. the gradual termination of a groove on the body of an object not ending there, as the upper termination of a flute in a twist drill.
b. Also called back clearance. a space in a depressed area of an object into which a machine tool or grinding wheel may safely enter at the end of a pass or operation.
2. the merging of a curved surface into another surface.
3. an act or instance of running away so as to evade, abandon, or avoid something.
4. a person who runs away so as to avoid payment or duty.
5. an act or instance of expiring or becoming depleted: the runout of a union contract; a runout in office supplies.
6. uneven wear on the outer edges of a tire or on the rim of a wheel.

Origin:
1925–30; n. use of v. phrase run out
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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