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.
To grow longer
produce, increase, expand; see grow 1. See syn. study at extend.
"lengthen." YourDictionary, n.d. Web. 20 April 2019. <https://thesaurus.yourdictionary.com/Lengthen>.
lengthen. (n.d.). Retrieved April 20th, 2019, from https://thesaurus.yourdictionary.com/Lengthen
To make or become longer:
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