Definitions from Wiktionary (main line)

▸ noun:  (chess) A standard sequence of opening moves considered to be best play.
▸ noun:  Alternative form of mainline [(aviation) An airline's main operating unit, as opposed to codeshares or regional subsidiaries.]
▸ adjective:  (chess) Alternative form of mainline [Normal, principal or standard.]
▸ Also see main_line

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