1. reversal; return
この返しは予想外だったのかもしれない。This return may have been unexpected.
2. return gift; return favour
お祝いの返しに何を贈ればいいか迷う。I can't decide what to give in return for the congratulatory gift.
3. barb (on a fishing hook)
返しのある針は魚が外れにくい。With a barbed hook, the fish is less likely to come off.
4. mixture of soy sauce, sugar and mirin