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Synonyms for lengthen

verb

  1. To make longer

    extend, stretch, reach, elongate, protract, prolongate, prolong, distend, dilate, amplify, draw out, expand, augment, proceed, continue, string out*, let out*; see also increase 1.

    Antonyms decrease*, contract, draw in.

  2. To grow longer

    produce, increase, expand; see grow 1. See syn. study at extend.

See lengthen in Webster's New World Roget's A-Z Thesaurus II

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