Online Google Dictionary

befouling 中文解釋 wordnet sense Collocation Usage Collins Definition
Verb
/biˈfoul/,
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befouled, past participle; befouling, present participle; befouled, past tense; befouls, 3rd person singular present;
  1. Make dirty; pollute
    • - they befoul our water with mining

  1. (befouled) made dirty or foul; "a building befouled with soot"; "breathing air fouled and darkened with factory soot"