English Reference
Verb

mainline

v.
C2 Proficiency US /ˈmeɪnˌɫaɪn/ UK /mˈeɪnlaɪn/ main·line UK spelling mainlined, mainlines, mainlining Aviation Computing Fishing

v.to inject a drug directly into a vein. In a more general way, it can mean to experience or consume something very quickly and intensely.

v.to inject a drug intravenously; by extension, to consume or integrate something in a direct, concentrated, or unfiltered manner. Often used metaphorically in computing to describe merging code into a primary development branch.


SIMPLE

He was caught trying to mainline heroin in the alley.

CONTEXTUAL

The developer worked all weekend to mainline the new security patches into the software's core repository.

COMPLEX

Fans of the series tend to mainline every new season in a single sitting, consuming the entire narrative arc before the spoilers can reach social media.

Usage

The verb is transitive and typically takes a direct object representing the substance or content being consumed.

It’s an intriguing selection, spanning a Game Boy Colour reimagination, a PlayStation Portable prequel, and the culmination of the mainline series respectively.

The Guardian· 21 Aug 2026

Participants' faiths included evangelical Christian, Catholic, Muslim, Jewish, Latter-day Saint, Sikh, mainline Protestant, Hindu and Buddhist, as well as agnostic, atheist and spiritual nonreligious.

Phys.org· 19 Aug 2026
This entry
Level C2 · Proficiency
Frequency Occasional
Updated