10
widen(verb, take, go, set, cover)
9
drag out(verb, expression, phrasal verb, take, go)
9
raise(verb, advance, increase, rise, extend)
9
spread(verb, take, cover, advance, increase)
8
develop(verb, take, set, cover, advance)
8
magnify(verb, take, go, cover, advance)
8
maximize(verb, increase, rise, maximum, up)
8
multiply(verb, take, set, cover, advance)
7
aggrandize(verb, take, cover, advance, increase)
7
blow up(verb, expression, increase, open, develop)
6
add to(verb, expression, take, cover, increase)
6
boost(verb, take, cover, advance, increase)
6
burgeon(verb, increase, open, develop, extend)
6
defer(verb, hold, delay, extend, put)
6
fatten(verb, increase, open, develop, extend)
6
thicken(verb, advance, increase, open, develop)
5
add(verb, increase, rise, boost, swell)
5
enhance(verb, take, cover, advance, increase)
5
heighten(verb, take, cover, advance, increase)
5
make longer(verb, expression, idiom, increase, delay)
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>