in a way that is carefully planned in order to achieve a particular aim in a particular situation 有谋略的;手段高明的;善于谋划的 in a way that is connected with military tactics 作战的 - vote tactically (British English)
to vote for a particular person or political party, not because you support them, but in order to prevent somebody else from being elected (并非真心支持而是为防止他人当选的)战术投票,策略性投票 Some voters may choose to vote tactically to try and secure a change of government. 一些选民可能会选择战术性投票,试图确保政府更迭。