adulterate/əˈdʌltəreɪt; ə`dʌltəˌret/ v[Tn]make (sth) poorer in quality by adding another substance 使（某物）质量因搀入它物而变劣; 搀假; 搀杂 adulterated milk, eg with water added 搀假的奶（如加水的）.
牛津英汉双解词典