1) Be a good designated driver 2) Choose not to choose 3) Choose not to participate 4) Choose not to vote 5) Choose not to vote, or drink 6) Choose to not participate 7) Decline to decide 8) Decline to vote 9) Fast 10) Forbear 11) Forgo 12) French word used in English 13) Go without 14) Go without alcohol 
• (v. i.) To hold one`s self aloof; to forbear or refrain voluntarily, and especially from an indulgence of the passions or appetites; -- with from. • (v. t.) To hinder; to withhold.
Ab·stain' intransitive verb [ imperfect & past participle Abstained ; present participle & verbal noun Abstaining .] [ Middle English absteynen , abstenen , Old French astenir , abstenir , French absteni...Ab·stain' transitive verb To hinder; to withhold. « Whether he abstain men from marrying. Milton. » 
[v] - refrain from voting 2. [v] - choose to refrain
abstain To hold oneself back; voluntarily do without; refrain (from); abstention.
refrain verb choose not to consume; `I abstain from alcohol`
to hold oneself back voluntarily, esp. from something regarded as improper or unhealthy (usually fol. by from): to abstain from eating meat. · to refrain from casting one's vote: a referendum in which two delegates abstained.
[SAT terms] choose not to consume