trench foot

noun

1. 壕沟足（因在泥水中时间过长而造成足部皮肉坏死）
   a painful condition of the feet, in which the flesh begins to decay and die, caused by being in mud or water for too long

1. This was the rainy season and the ground was soft, and his face had scored a trench a foot deep and a couple of yards long.
   适逢雨季，地面稀软，他的脸在地上划出一道没过脚踝的深沟，足有两码长。

noun

1. resembling frostbite but without freezing

   Synonym:    immersion foot