Definitions for "Party line"
the official doctrine or platform of a political party. The term is often used in a derogatory sense, implying a rigid adherence to party policy, as in communist bureaucrats always had to toe the party line.
the policy of a political group; "He won in a vote along party lines"
a telephone line serving two or more subscribers
a minority opinion in Christianity world-wide, in American Christianity, in American Protestant Christianity, and, if Anglican dissidents within and without ECUSA could be properly counted, quite possibly in American Anglicanism