turnbuckle
/ˈtɜrnˌbʌkəl/
noun
- A metal device with threaded ends used to adjust the tension or length of a cable, rope, or rod.
- The construction worker adjusted the turnbuckle on the support cables.
- A turnbuckle is often used in fencing to keep the wire taut.
- The sailor tightened the turnbuckle to secure the rigging on the sailboat.