1. assume the innocence or truthfulness of someone even if you cannot be sure
be willing to give someone the benefit of the doubt
If you say you intend to give someone the benefit of the doubt it means you intend to accept that something or someone is true or has honest intentions when there is no evidence to suggest otherwise. If you give someone 'the benefit of the doubt' you intend to trust someone until they are proven wrong even if you have doubts. This is an idiom used in both social and professional contexts.