RECIPROCATE

[verb] [formal] - to share the same feelings as someone else, or to behave in the same way as someone elseHe loved and admired her and felt that his love was reciprocated. [T]If you show trust to somebody, that trust will be reciprocated. [T]We invited them to dinner and a week later they reciprocated. [I](formal) If a part of a machine reciprocates, it moves backwards and forwards.Some electric razors have reciprocating heads.