buttress[noun]Synonyms:- support, brace, mainstay, prop, reinforcement, stanchion, strut
[verb]Synonyms:- support, back up, bolster, prop up, reinforce, shore up, strengthen, sustain, uphold
[TahlilGaran] English Synonym Dictionary ▲
II. buttress2 verb [transitive] formal to support a system, idea, argument etc, especially by providing money:
The evidence seemed to buttress their argument. [TahlilGaran] Dictionary of Contemporary English ▲