party line

/P AA1 R T IY0 L AY1 N/
noun
  1. 1

    A single telephone line which is shared by two or more households.

  2. 2

    The official policy of a political party or other organization.

    โ€œThe party line is that the exploding widgets are a result of user error.โ€

Source: https://en.wiktionary.org/wiki/party%20line