adulterate /əˈdʌltəreɪt/ TEM8 ( adulterating, adulterated, adulterates )

• 1. 

  V-T If something such as food or drink is adulterated, someone has made its quality worse by adding water or cheaper products to it. (给食物、饮料等) 掺假 [usu passive]

  例：

  The food had been adulterated to increase its weight.

  这种食物被掺了假以增加其重量。