English Antonyms Practice Test 6

Augment : make (something) greater by adding to it; increase.
Constrain : compel or force (someone) to follow a particular course of action.
Restrain : prevent (someone or something) from doing something; keep under control or within limits.
Diminish : make or become less.
Circumscribe : restrict (something) within limits.

Antonym of Augment is Diminish