tactical voting
noun /ˌtæktɪkl ˈvəʊtɪŋ/
/ˌtæktɪkl ˈvəʊtɪŋ/
[uncountable] (British English)- the act of voting 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