第三人称单数：数：befouls
现在分词：：befouling
弄脏；败坏；弄臭( befoul的过去式和过去分词 )；使堕落；
adj
1. made dirty or foul
e.g. a building befouled with sootbreathing air fouled and darkened with factory soot
Synonym: fouled
