do a line with (someone)

do a line with (someone)

To be in a romantic relationship with someone. Primarily heard in New Zealand, Ireland. A: "I thought Billy was single." B: "Nah, he's been doing a line with Mel for a few months now."

See also: line

do a line with someone

have a regular romantic or sexual relationship with someone. Irish & New Zealand informal

See also: line, someone