noun
- The pipeline carrying wastewater to the public drains or a septic tank.
- In longline fishing the central line to which the branch lines with baits are attached.
- An airline's main operating unit, as opposed to codeshares or regional subsidiaries.
- The principal route or line of a railway.
- A principal vein into which a drug can be injected.
- The main repository for a software project, from which different versions (forks) may be split off.
adj
- Normal, principal or standard.
- Of or pertaining to the principal route or line of a railway.
- Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.
- Of a sequence of opening moves: being part of a main line ("a standard sequence of opening moves considered to be best play").
verb
to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.![A tube or lip through which liquid or steam is poured or discharged. [[File:Spout (PSF).png|thumb|]]](/search?text=A+tube+or+lip+through+which+liquid+or+steam+is+poured+or+discharged.+%5B%5BFile%3ASpout+%28PSF%29.png%7Cthumb%7C%5D%5D&lang=en){kind=link}