遊ゆう環かん

noun

loop; keeper

Refers to the small loop on a watch strap that holds the excess strap in place. A technical term in watchmaking.

• 時計とけいの遊ゆう環かんが壊こわれたので、交こう換かんしてもらった。

  The keeper on my watch strap broke, so I had it replaced.