mainline

[meyn-lahyn, -lahyn]

verb (used without object)

Slang.

mainlined, mainlining 

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)

Slang.

mainlined, mainlining 

1. to inject (a narcotic, especially heroin) directly into a vein.

2. to use, enjoy, or imbibe (something) without restriction.

   mainlining coffee all day long.

adjective

1. having a principal, established, or widely accepted position; major; mainstream.

   the membership of mainline churches.

Word History and Origins

Origin of mainline¹

1935–40, v., adj. use of main line

Example Sentences

A ground stop was issued for the company's mainline flights from departure airports, causing issues at airports including Chicago, Denver, Houston, San Francisco and New Jersey.

From BBC

The previous Conservative UK government originally supported the electrification of the south Wales mainline to Swansea, but later cancelled it beyond Cardiff.

From BBC

In north Wales, the Welsh government has been pushing for work on the Wrexham to Liverpool route to enable metro-style services, and upgrades on the north Wales mainline to boost the frequency of services.

From BBC

He used to present as a staid mainline Episcopalian, but now he denounces that church and speaks of being "mauled by demons."

From Salon

Training to become a driver of mainline trains generally takes between one and two years.

From BBC

Related Words

• dominant 
• key 
• leading 
• main 
• major 
• outstanding 
• paramount 
• predominant 
• preeminent 
• primary 
• prime 
• prominent