Tighten /(?)/

Tight·en

Tighten

v. t.

imp. & p. p. Tightened; p. pr. & vb. n. Tightening

  1. To draw tighter; to straiten; to make more close in any manner.
    Just where I please, with tightened rein I'll urge thee round the dusty plain.
    — Fawkes.

Phrases & Compounds
Tightening pulley
a pulley which rests, or is forced, against a driving belt to tighten it.