turnbuckle -
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
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Wiktionary
Substantiv
turnbuckle -
A coupling device consisting of two eyelets or other connection points connected in screwthreads. The joint in between can be turned to shorten or lengthen the device with mechanical advantage provided by the screw threads.
turnbuckle -
A linkthreaded on both ends of a short bar which is used to pull objects together.
Wikipedia
A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eyelets, one screwed into each end of a small metal loop, one with a left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the loop, which causes both eyelets to be screwed in or out simultaneously, without twisting the eyelets or attached cables.
