| Answer | Crossword Clue |
|---|---|
| ENURE | Toughen by exposure |
| PLANISH | Toughen metal by hammering |
| ANNEAL | Toughen by heating, as glass |
| RET | Injure by exposure. |
| AIRSET | Hardened by exposure |
| INURES | Toughens by exposure |
| RET | Harm by exposure to moisture |
| INURED | Made tough by habitual exposure |
| WEATHERS | Seasons by exposure to the air. |
