turnbuckle

英 ['tɜːnbʌkl] 美 ['tɝn,bʌkl]
  • n. 套筒螺母；螺丝扣
turnbuckle
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英文词源

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.