1. (verb) tighten, fasten
make tight or tighter
Synonyms: fasten, tighten up, fix, tighten, constrain, reduce, secure, stiffen
2. (verb) tighten
become tight or tighter
Synonyms: fasten, stiffen, constrain, reduce, tighten up
3. (verb) stiffen, tighten, tighten up, constrain
restrict
Synonyms: fasten, restrain, tighten up, encumber, tighten, constrain, cumber, reduce, stiffen
4. (verb) reduce, tighten
narrow or limit
Synonyms: bring down, decoct, slim down, quash, boil down, foreshorten, trim down, slim, constrain, cut, trim back, trim, slenderize, cut back, stiffen, cut down, subjugate, thin out, shrink, abridge, come down, contract, melt off, fasten, subdue, scale down, concentrate, deoxidize, shorten, dilute, thin, tighten up, deoxidise, reduce, abbreviate, keep down, lose weight, repress, tighten
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Synonyms and Antonyms of tighten 
