mainline

[meyn-lahyn, -lahyn] /ˈmeɪnˌlaɪn, -ˈlaɪn/
verb (used without object), mainlined, mainlining. Slang.
1.
to inject a narcotic, especially heroin, directly into a vein.
2.
to use or enjoy something without restriction:
to mainline on TV movies.
verb (used with object), mainlined, mainlining. Slang.
3.
to inject (a narcotic, especially heroin) directly into a vein.
4.
to use, enjoy, or imbibe (something) without restriction:
mainlining coffee all day long.
adjective
5.
having a principal, established, or widely accepted position; major; mainstream:
the membership of mainline churches.
Origin
1935-40, Americanism; v., adj. use of main line
Examples from the web for mainline
  • First, look at today's mainline media, a hotbed of forty-year-old thinking.
  • Amenities on the protected side of a mainline levee, including golf courses and some hotels, will remain open.
  • Overall, he says, evangelical churches grow in members during recessions while mainline ones decline.
  • Summary of input variables for mainline freeway segments.
  • The mainline will be one set of alternates and the side and outer roads would be the other.
  • As the mainline is hauled it is stored directly back onto the reel.
  • Uncap the mainline to drain, especially if an emitter is not located at the low point in the system, then re-cap.
British Dictionary definitions for mainline

main line

noun
1.
(railways)
  1. the trunk route between two points, usually fed by branch lines
  2. (as modifier): a main-line station
2.
(US) a main road
verb
3.
(intransitive) (slang) to inject a drug into a vein
adjective
4.
having an important position, esp having responsibility for the main areas of activity
Derived Forms
mainliner, noun
Word Origin and History for mainline
v.

also main-line, 1934, from main line in American English slang sense "principal vein into which drugs can be injected" (1933).

Slang definitions & phrases for mainline

mainline

verb
  1. To inject narcotics into a blood vessel; shoot up: after mainlining heroin the night before (1930s+ Narcotics)
  2. To take or administer stimulants or depressants of various sorts: because the economy was mainlining bigger and bigger fixes of inflation/ LA and the San Joaquin valley mainlined northern California water and couldn't wait for the next fix