173 entries under strengthen topic. ×

3
cement(verb, close, set, develop, secure)
3
develop(verb, form, study, secure, join)
3
empower(verb, support, increase, establish, extend)
3
energize(verb, support, increase, raise, stimulate)
3
enliven(verb, encourage, stimulate, restore)
3
inspissate(verb, set, swell, dry)
2
add to(verb, expression, support, increase, develop)
2
become one(verb, expression, meet, join, link)
2
beef up(verb, expression, support, increase, boost)
2
concentrate(verb, develop, secure, join, unite)
2
condense(verb, form, set, develop, secure)
2
connect(verb, place, set, meet, develop)
2
hook up with(verb, expression, idiom, meet, develop)
2
jelly(verb, form, set, develop, combine)
2
league(verb, meet, develop, secure, join)
2
precipitate(verb, close, set, settle, firm)
2
restore(verb, support, increase, raise, strength)
2
shore up(verb, expression, support, increase, sustain)
2
stabilize(verb, place, set, develop, secure)
1
build up(verb, expression, support, increase, develop)
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APASmart Define. (2016). harden thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/harden/thesaurus/synonyms
ChicagoSmart Define. 2016. "harden thesaurus" https://smartdefine.org/harden/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, harden thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/harden/thesaurus/synonyms>.
MLASmart Define. "harden thesaurus" 24 March 2016. Web. 1 October 2026. <https://smartdefine.org/harden/thesaurus/synonyms>