Definition of 返却口 (へんきゃくぐち)
へんきゃくぐち
                        返却口
へんきゃくぐち
henkyakuguchi
noun
•
        
return slot (for coins in a vending machine), drop-off point (for dirty dishes at a restaurant)
Related Kanji
| 返 | return, answer, fade, repay | 
| 却 | instead, on the contrary, rather, step back, withdraw, retreat | 
| 口 | mouth |