the official opinions and policies of a political party, which members are expected to support 政党的路线 Oxford Collocations DictionaryParty line is used before these nouns:- vote
Idioms
toe the (party) line
(North American English also toe the mark)
to say or do what somebody in authority tells you to say or do, even if you do not share the same opinions, etc. 顺从当局（或集体）；遵循…路线 One or two of them refused to toe the line. 他们中的一两个拒绝排队。 MPs rarely fail to toe the party line. 国会议员很少不参加派对。