Definitions
Make something firmer, stricter, or less loose.
Word origin
Synchronically equivalent to tight + -en, but actually derived from Middle English tighten, from Old English tyhtan, thus originally unrelated to tight (Old English *þiht).
Used in a sentence
“Please tighten that screw a quarter-turn.”
“Just where I please, with tighten;d rein / I'll urge thee round the dusty plain.”
“That joint is tightening as the wood dries.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Make less loose”7 letters
02“Make more secure”7 letters
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