Reciprocate

re·cip·ro·cate (r-spr-kt)
v. re·cip·ro·cat·ed, re·cip·ro·cat·ing, re·cip·ro·cates
v. tr.

1. To give or take mutually; interchange.
2. To show, feel, or give in response or return.

v. intr.

1. To move back and forth alternately.
2. To give and take something mutually.
3. To make a return for something given or done.
4. To be complementary or equivalent.

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re·cipro·cative adj.
re·cipro·cator n.

Synonyms: reciprocate, requite, return
These verbs mean to give, take, or feel reciprocally: doesn't reciprocate favors; consideration requited with disregard; return a compliment.

reciprocate

v 1: act, feel, or give mutually or in return; "We always invite the neighbors and they never reciprocate!"
2: alternate the direction of motion of; "the engine reciprocates the propeller"