reciprocate
/rɪˈsɪprəˌkeɪt/
verb
- To respond to a gesture or action by making a corresponding one; to give or do something in return.
- If someone invites you to dinner, it's polite to reciprocate by inviting them another time.
- When she smiled at him, he reciprocated with a warm grin.
- The company reciprocated the employee's loyalty with a generous bonus.
- To cause (a part of a machine) to move backward and forward in a straight line.
- In a reciprocating saw, the blade moves back and forth to cut through materials.
- The engineer explained how the crank converts the reciprocating motion into rotary motion.
- The piston reciprocates inside the cylinder of an engine.
Antonyms