5
mantle(verb, take, cover, increase, open)
5
produce(verb, phrasal verb, increase, long, length)
5
prolongate(verb, take, go, cover, increase)
5
stretch out(verb, expression, phrasal verb, increase, open)
5
string out(verb, expression, phrasal verb, take, go)
5
wax(verb, advance, increase, open, develop)
4
advance(verb, increase, maintain, raise, rise)
4
attenuate(verb, withdraw, extend, select, choose)
4
keep up(verb, expression, advance, maintain, continue)
4
let out(verb, expression, phrasal verb, take, cover)
4
pad(verb, take, go, cover, advance)
4
project(verb, advance, maintain, continue, stay)
4
reach(verb, go, set, cover, advance)
3
delay(noun, verb, continue, extend, sustain)
3
elaborate(verb, increase, open, develop, extend)
3
jut(verb, extend, dominate, project, bulge)
3
maintain(verb, advance, continue, stay, extend)
3
procrastinate(verb, delay, draw, extend, sustain)
3
pyramid(verb, go, cover, increase, open)
3
redouble(verb, advance, increase, raise, rise)
10 years ago|8.3k views|share |citing 
APASmart Define. (2016). lengthen thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/lengthen/thesaurus/synonyms
ChicagoSmart Define. 2016. "lengthen thesaurus" https://smartdefine.org/lengthen/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, lengthen thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/lengthen/thesaurus/synonyms>.
MLASmart Define. "lengthen thesaurus" 9 March 2016. Web. 25 September 2026. <https://smartdefine.org/lengthen/thesaurus/synonyms>