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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  1 US : an act or action that helps someone : an act of assistance He wrote the story with an assist from a friend. [=with the help of a friend]