vt. 弄脏

[ verb ]
spot, stain, or pollute
<verb.change> defile foul maculate
The townspeople defiled the river by emptying raw sewage into it

Befoul \Be*foul"\, v. t. [imp. & p. p. {Befouled}; p. pr. & vb.
n. {Befouling}.] [Cf. AS. bef?lan; pref. be- + f?lan to foul.
See {Foul}, a.]
1. To make foul; to soil.

2. To entangle or run against so as to impede motion.