abstain

Short definition from Wiktionary

Verb

1. 1
   Keep or withhold oneself.
2. 2
   Refrain from (something or doing something); keep from doing, especially an indulgence.
3. 3
   Fast (not eat for a period).
4. 4
   Deliberately refrain from casting one's vote at a meeting where one is present.
5. 5
   Hinder; keep back; withhold.