Simple past tense and past participle of mainline.(verb)
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Use "mainlined" in a sentence
"Because it is lucrative, our multinationals offer them extremely low wage labor [sic] that cannot be turned down. blames this kind of now rampant conditioning of students by progressives on philosophical elites at the turn of the twentieth century - notably those who "mainlined" John Dewey's"
"YOU Matt, with your fearless devotion to revealed truth, have patiently and unalterably mainlined the notion of an increasingly unavoidable doomsday scenario directly into my brain."
"This cognitive relativist stuff is stuff Obama mainlined in college and at law school."