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tighten (v.)

"to make tight," 1727; the earlier verb was simply tight, from Old English tyhtan, from the root of tight. Related: Tightened; tightening.

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Definitions of tighten from WordNet

tighten (v.)
make tight or tighter;
Synonyms: fasten
tighten (v.)
become tight or tighter;
The rope tightened
tighten (v.)
severely restrict in scope or extent;
tighten the rules
Synonyms: stiffen / tighten up / constrain
tighten (v.)
narrow or limit;
Synonyms: reduce
From wordnet.princeton.edu