mainline
verb (used without object)
to inject a narcotic, especially heroin, directly into a vein.
mainlines
-
present tense formof mainline (3rd person singular).present tense
Used to describe things happening now or regularly.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Trunk lines appear to be in better condition than the utility’s mainlines.
From Los Angeles Times ● Jul. 25, 2026
He mainlines all of his romantic entanglements as if they were the antidote to his unresolved traumas.
From Salon ● Apr. 25, 2025
Afterward, Healey said the agency was underestimating the blockages on Westlake, including relocation of two sewer mainlines.
From Seattle Times ● Jul. 28, 2023
Current labor agreements ensure that freight trains on mainlines have two people — an engineer and conductor — onboard.
From Washington Post ● Mar. 3, 2023
Other operators will also run some trains on the east coast and west coast mainlines.
From BBC ● Jun. 15, 2022
