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back clearance

noun
1.
runout (def 1b).

runout

[ruhn-out] /ˈrʌnˌaʊt/
noun
1.
Machinery.
  1. 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.
  2. 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
1925-1930
1925-30; noun use of verb phrase run out
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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