reciprocate

You reciprocate when you return a favor, return a compliment, or respond "the same to you" to the angry guy in the car you just passed. In short, you react to an action, statement, or emotion by mirroring it.

This one comes from the Latin verb reciprocare, meaning to move back and forth. Its root makes it sound as if reciprocate implies only a physical action, but it's also used for the less tangible. If you fail to pay the rent, your landlord might reciprocate by evicting you. If your crush acts like he doesn't know you exist when you pass him in the halls, it's probably safe to say he does not reciprocate your amorous feelings.

Definitions of reciprocate
  1. verb
    act, feel, or give mutually or in return
    “We always invite the neighbors and they never reciprocate!”
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    types:
    return
    return in kind
    redound
    return or recoil
    type of:
    act, move
    perform an action, or work out or perform (an action)
  2. verb
    alternate the direction of motion of
    “the engine reciprocates the propeller”
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    type of:
    move
    move so as to change position, perform a nontranslational motion
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