Synonyms|216Antonyms|49|Broader|12Narrower|0Related|56
1
sign(verb, support, back, uphold, prove)
1
sign off on(expression, idiom, support, back, sign)
1
size up(expression, support, back, uphold, explain)
1
stand
1
stomach
1
subsidize
1
thumbs up(expression, support, back, sign, uphold)
1
undergird
1
underlay
1
validate(verb, prove, verify, substantiate, corroborate)
1
verify(verb, support, back, explain, prove)
0
add force to(verb, expression, phrasal verb)
0
add fuel to fire(expression, idiom, strengthen, buttress)
0
add to(expression, strengthen, buttress)
0
adhere
0
agree
0
aid
0
apply(verb, continue, stay, extend, sustain)
0
approve of(verb, expression, phrasal verb)
0
assemble(verb, continue, stay, extend, sustain)
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APASmart Define. (2015). underpin thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/underpin/thesaurus/synonyms
ChicagoSmart Define. 2015. "underpin thesaurus" https://smartdefine.org/underpin/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, underpin thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/underpin/thesaurus/synonyms>.
MLASmart Define. "underpin thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/underpin/thesaurus/synonyms>