party line
nounBrE BrE//ˌpɑːti ˈlaɪn//; NAmE NAmE//ˌpɑːrti ˈlaɪn//
[usually singular]to say or do what somebody in authority tells you to say or do, even if you do not share the same opinions, etc. One or two of them refused to toe the line. to toe the party line
Check pronunciation: party line