different between testpiece vs waisting

English

test +? piece

testpiece (plural testpieces)

waist +? -ing

waisting (plural waistings)

That which goes at the waist (of a person, as on a garment, or of an object).
The decorative material used as waisting also served as a girdle for her midlife expansion.
A failure in mechanical testing, where part of the testpiece becomes narrow.

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