Meaning of the word mainline in English

What does mainline mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

mainline

US /ˈmeɪn.laɪn/
UK /ˈmeɪn.laɪn/

Noun

a principal road, railway line, or conduit

Example:
The accident occurred on the railway mainline.
The city's water supply comes from a large mainline pipe.

Verb

to inject a drug directly into a vein

Example:
He was known to mainline heroin.
The patient needed to be mainlined with fluids.

Adjective

of or relating to a principal road, railway line, or conduit

Example:
The mainline train was delayed due to a signal failure.
They are working on upgrading the mainline infrastructure.