Alternative spelling of mainline

plural of rhumb line

(nautical) A line that cuts all meridians at the same angle, the path of a vessel that maintains a constant compass direction.

(fencing) The target area above the opponent's midriff.

Synonym of underscore / (fencing) The target area below the opponent's midriff.

A railway line on which trains travel towards a major terminus.

A railway line on which trains travel away from a major terminus. / (travel, aviation) the next and subsequent flights in an itinerary.

Alternative spelling of up line

Describing a higher level in a hierarchical management structure

(chiefly UK) A railway track; a pair of rails on which a railway train runs.