I think that antonym for abstain is to do it

Buddhists have five precepts or ethic requirements that they must adhere to. They must abstain from killing, abstain from taking what is not given, abstain from sexual misconduct, abstain from false speak, and abstain from drinking alcohol.

If you are refering to abstain from eating meat, the answer is "NO."

Rather than vote yea or nay, I choose to abstain.

Boycott means to refuse to buy, use, or participate in something as a form of protest or to express disapproval. It is a deliberate decision to avoid or abstain from supporting a person, organization, or product based on ethical or political reasons.