vi.[(+from)]

1. 戒；避免；避開
   The doctor asked the patient to abstain from smoking.

   醫生叫這位病人戒菸。

2. 棄權
   Some voters abstained in the election.

   一些選民在選舉中棄了權。

v.

1. (often abstain from) restrain oneself from doing something.
2. formally decline to vote.