main line

US /ˈmeɪn ˌlaɪn/
UK /ˈmeɪn ˌlaɪn/
"main line" picture
1.

a principal railway line

:
•
The express train runs on the main line.
•
Repairs to the main line caused significant delays.
2.

a principal pipeline or conduit for water, gas, or electricity

:
•
A burst main line caused a widespread power outage.
•
The city is upgrading its water main lines.
3.

the most important or essential part of something

:
•
Let's get to the main line of the argument.
•
The main line of his research focuses on climate change.
:
coreessencegistcruxheart
:
mainlinelinedliningA-linein line withbe in line for