Main

Short for mainline.

To mainly play a specific character, or side, during a game.

"He mains the same character as me in that game."

Of a road: to convert into a main or primary road.

Of chief or leading importance; prime, principal.

Chief, most important, or principal in extent, size, or strength; consisting of the largest part.

"main timbers  main branch of a river  main body of an army"

(of force, strength, etc.) Full, sheer, undivided.

Big; angry.

Exceedingly, extremely, greatly, mightily, very, very much.