- a prominent and readily accessible vein of the body that may be used for a narcotic's injection.
- the act of mainlining.
Words nearby main line
Origin of main line
Definition for main line (2 of 2)
OTHER WORDS FROM Main LineMain-Line, adjectiveMain-Lin·er, noun
Examples from the Web for main line
There are some side-lines, with but two or three trains a day—side-lines that reach the main-line only through other branches.
"It's just as well, I guess," said the main-line superintendent carelessly.The Taming of Red Butte Western|Francis Lynde
Then once more he caught up the severed end of the main-line wire, and touched the opposite side of the instrument.The Young Railroaders|Francis Lovell Coombs
The Natural Bridge is not far from Field, the main-line railway town that serves as a center for this national playground.Your National Parks|Enos A. Mills
Finally, after a vast amount of argument, the main-line divisions were settled, and attention was given to the side-lines.
British Dictionary definitions for main line
- the trunk route between two points, usually fed by branch lines
- (as modifier)a main-line station