a strap attached to the rear or bottom part of something, used for carrying, securing, or fastening.
Compound of 'butt' (end portion) and 'strap' (strip of material for fastening), created through standard English word combination for functional description.
Buttstraps on gun cases, packs, and equipment are invisible engineering—you don't notice them until they fail, then you realize everything depends on a thin strip of leather.
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