Etymology
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turnbuckle (n.)

also turn-buckle, 1703, "catch or fastening for windows and shutters," from turn (v.) + buckle (n.). Meaning "coupling with internal screw threads for connecting metal rods" is attested from 1877.

updated on February 20, 2014

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Definitions of turnbuckle from WordNet

turnbuckle (n.)
an oblong metal coupling with a swivel at one end and an internal thread at the other into which a threaded rod can be screwed in order to form a unit that can be adjusted for length or tension;
From wordnet.princeton.edu, not affiliated with etymonline.