mainline

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From main + line.

not comparable Normal, principal or standard.
US, not comparable Not fundamentalist, charismatic or evangelical. At a time when mainline denominations are engaged in massive closures of small rural churches, independent charismatics are strategically helping to rechurch rural Canada.
not comparable Of or pertaining to the principal route or line of a railway.
not comparable Of or pertaining to a surface-level heavy rail system as distinct from an underground, elevated or light rail one.
not comparable Of or pertaining to national or long-distance rail network operators as opposed to urban and suburban operators. Merseyrail and mainline services affected by downpour with more heavy rain forecast
not comparable Pertaining to a direct route between two major ports.
not comparable Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play"). After 3 e5 the Czech Benoni Defense is created. Unlike the mainline 3 e6, which aims for tactical counterplay in the center, Black aims for solidity there. He will choose later what flank to attack on.

slang To inject (a drug) directly into a vein. The patient skinpopped for 1½ years and then started to mainline heroin.
broadly, informal, transitive To consume voraciously. Last month, she lamented that her busy campaign schedule had kept her from mainlining Amazon’s new “Rings of Power” series.
transitive To integrate (code, etc.) into the main repository for a software project, rather than separate forks.
transitive To include (a prisoner) in the general population of a prison.

An airline's main operating unit, as opposed to codeshares or regional subsidiaries.
The principal route or line of a railway.
In longline fishing the central line to which the branch lines with baits are attached.
The pipeline carrying wastewater to the public drains or a septic tank. 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.
slang A principal vein into which a drug can be injected. I'm searching for my mainline / I said I couldn't hit it sideways
The main repository for a software project, from which different versions (forks) may be split off.
alternative Alternative form of main line.main line 8. ...Qe7! is the mainline and Black unpins with Nc6-d8-e6 […]
The general population of a prison.