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Phrases. 1  be of assistance. 2  Be of practical use or help. âthe guide will be of assistance to development groupsâ. ââWe hope this small fund and material aid will be of assistance to the victims,â a press release stated.â.
Definition of assist. 1  transitive verb. : 2  to give usually supplementary support or aid to She assisted the boy with his lessons. 3  intransitive verb. 4  1 : to give support or aid assisted at the stove Another surgeon assisted on the operation. 5  2 : to be present as a spectator â¦ the ideal figures assisting at Italian holy scenes.