Vote down typically refers to a situation where a group of individuals express their disapproval or rejection towards a particular proposal, idea, or decision. The antonyms for vote down, on the other hand, would refer to expressions of support, agreement, or endorsement. Some of the antonyms for vote down include voting for, approve, support, endorse, back, recommend, and commend. Voting for refers to expressing a positive vote or showing support for a proposal. Approve suggests the acceptance or authorization of a particular idea or decision. Support implies the provision of assistance or help towards a certain goal or idea, while endorse denotes giving an official backing or recommendation for a proposal. Finally, recommend and commend suggest showing approval or praise towards a particular course of action or idea.