An example of abstain is to not eat animal products during Lent.
Forty senators voted in favor of the bill, 45 voted against it, and 15 abstained.
Abstain from partisan political rhetoric; abstain from drinking alcohol.
An example of abstain would be a senator who chooses not to vote on a particular bill.
To abstain from smoking.
Origin of abstain
From American Heritage Dictionary of the English Language, 5th Edition