93 entries under expression topic. ×

6
tighten up(verb, phrasal verb)
3
beef up(verb, phrasal verb, support, increase)
2
shore up(verb, support, increase, sustain)
1
add fuel to fire(verb, idiom, support, increase)
1
add to(verb, support, increase, sustain)
1
attend to(verb, keep, maintain, encourage)
1
back up(verb, support, increase, sustain)
1
become rigid(verb, harden, thicken, solidify)
1
bring up(verb, keep, maintain, encourage)
1
build up(verb, support, increase, sustain)
1
buoy up(verb, keep, maintain, encourage)
1
care for(verb, keep, maintain, encourage)
1
chill to the bone(idiom, bite, chill, nip)
1
freeze to(verb, place, set, secure)
1
give a leg up(verb, idiom, keep, maintain)
1
glob up(set, freeze, thicken, coagulate)
1
heat up(verb, support, increase, sustain)
1
ice over(freeze, bite, chill, nip)
1
ice up(freeze, bite, chill, nip)
1
keep an eye on(verb, idiom, keep, maintain)
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APASmart Define. (2015). stiffen thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/stiffen/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiffen thesaurus" https://smartdefine.org/stiffen/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, stiffen thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/stiffen/thesaurus/synonyms>.
MLASmart Define. "stiffen thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/stiffen/thesaurus/synonyms>