TIGHTEN (_third-person singular simple present_ TIGHTENS, _present participle_ TIGHTENING, _simple past and past participle_ TIGHTENED)
* (transitive) To make tighter.
_Please TIGHTEN that screw a quarter-turn._
Just where I please, with TIGHTENED rein / I'll urge thee round the dusty plain.
* (intransitive) To become tighter.
_That joint is TIGHTENING as the wood dries._
* (economics) To make money harder to borrow or obtain.
_If the government doesn't TIGHTEN the money supply, inflation is certain to be harsh._
* (economics) To raise short-term interest rates.
_The Fed is expected to TIGHTEN by a quarter-point._
* (make tighter): loosen
* tighten one's belt
* tighten the purse strings