Green’s Dictionary of Slang

to walk arm-in-arm.

1902		J. Masefield ‘A Night at Dago Tom’s’ in Salt-Water Ballads 39: ’N’ we linked it home, did Bill ’n’ I, adown the scattered streets.
1972		(con. 1930s–40s) N. Conway Bloods 22: Many’s the soldier has had his name taken for linking the mot he’s just clicked on these streets.
1981		(con. 1930s) S. McAughtry Belfast 113: ‘I want to link blushy face here,’ and with that she took hold of my arm.