15
support(verb, support, hold, back, continue)
8
corroborate(verb, support, back, sign, uphold)
7
bear out(verb, expression, phrasal verb, support, back)
7
bolster(verb, support, hold, take, continue)
7
uphold(verb, support, hold, back, continue)
6
buttress(verb, support, hold, continue, stay)
6
prop(verb, support, hold, continue, stay)
6
sustain(verb, support, hold, continue, stay)
5
back(verb, support, sign, uphold, prove)
5
bear(verb, take, continue, stay, extend)
5
confirm(verb, prove, verify, substantiate, validate)
5
shore up(verb, expression, phrasal verb, support, take)
5
stay(verb, support, continue, extend, rest)
4
back up(verb, expression, phrasal verb, strengthen, verify)
4
brace(verb, support, hold, continue, stay)
4
carry(verb, support, hold, strengthen, reinforce)
4
hold(verb, support, continue, stay, extend)
4
prop up(verb, expression, phrasal verb, support, strengthen)
4
reinforce(verb, support, hold, strengthen, buttress)
4
shore(verb, support, hold, reinforce)
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APASmart Define. (2015). underpin thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/underpin/thesaurus/synonyms
ChicagoSmart Define. 2015. "underpin thesaurus" https://smartdefine.org/underpin/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, underpin thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/underpin/thesaurus/synonyms>.
MLASmart Define. "underpin thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/underpin/thesaurus/synonyms>