See assist in Webster's New World Roget's A-Z Thesaurus II
verb
To give support or assistance:
abet, aid, boost, help (out), relieve, succor. Idioms: give (or lend) a hand, give a leg up. See help
noun
The act or an instance of helping:
abetment, aid, assistance, hand, help, relief, succor, support. See help
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