noun
a system in which a telephone line is shared by multiple users, each having their own designated ring pattern to distinguish their calls
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The government officials stuck to the party line during the press conference.
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Everyone at the meeting seemed to be on the same party line about the project.
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I don't know why you're so worried about sticking to the party line, just say what you think.
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She always follows the party line, never straying from the group's opinions.