1
: the policy or practice of a political party
2
: a single telephone circuit connecting two or more subscribers with the exchange
called also party wire
3
: the principles or policies of an individual or organization
also
: the explanation or interpretation usually put forth
… the party line that her mother was a saint … —
Leslie Bennetts
: one that adheres to a party line
specifically
: one that adheres to the Communist party line
a directory of suspected Reds and party-liners —
Time
compare fellow traveler
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Merriam-Webster unabridged



