adulterate

Từ điển American Heritage Dictionary 4th

a·dul·ter·ate (ə-dŭlʹtə-rāt')tr.v. a·dul·ter·at·ed, a·dul·ter·at·ing, a·dul·ter·ates
To make impure by adding extraneous, improper, or inferior ingredients.adj. (-tər-ĭt)
1. Spurious; adulterated.
2. Adulterous. [Latin adulterāre, adulterāt-, to pollute. See al-¹ in Indo-European Roots.] a·dul'ter·aʹtion n.a·dulʹter·a'tor n. 
Synonyms: adulterate, debase, doctor, load
These verbs mean to make impure or inferior by adding foreign substances to something: adulterate coffee with ground acorns; silver debased with copper; doctored the wine with water; rag paper loaded with wood fiber.

• Từ đồng nghĩa / Synonyms:
  adulterated, debased, load, stretch, dilute, debase