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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.
aid. v. aidÂ·ed, aidÂ·ing, aids. v. tr. To provide assistance, support, or relief to: aided the researchers in their discovery; aided the prisoners' attempt to escape. v. intr. To provide assistance, support, or relief: aided in the effort to improve services to the elderly.