Mainline

Definitions

1. An airline's main operating unit, as opposed to codeshares or regional subsidiaries.
2. The principal route or line of a railway.
3. In longline fishing the central line to which the branch lines with baits are attached.
4. The pipeline carrying wastewater to the public drains or a septic tank.
5. A principal vein into which a drug can be injected.
   slang
6. The main repository for a software project, from which different versions (forks) may be split off.
7. The general population of a prison.

Equivalents

Examples

“Many plumbers will tell⟳ you they don't go off property since that is the local water company's responsibility. Most local water companies would prefer⟳ that, if a line is snaked, it is snaked all the way to the mainline connection.”

“In addition, opportunities exist⟳ for the introduction of these organisms into a system by means of broken or corroded piping, repair⟳ of existing mainlines, installation of new mains, back siphonage, and cross-connections, any of which may result⟳ in contamination of the water supply⟳.”

“I'm searching for my mainline / I said I couldn't hit it sideways”

“8. ...Qe7! is the mainline and Black unpins with Nc6-d8-e6 […]”

CEFR level