Etymology
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pipeline (n.)

1859, "continuous conduit of pipes chiefly laid underground," from pipe (n.1) + line (n.). Figurative sense of "channel of communication" is from 1921; surfer slang meaning "hollow part of a large wave" is attested by 1963.

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Definitions of pipeline

pipeline (n.)
gossip spread by spoken communication;
Synonyms: grapevine / word of mouth
pipeline (n.)
a pipe used to transport liquids or gases;
a pipeline runs from the wells to the seaport
Synonyms: line
From wordnet.princeton.edu