n. a horse used in skidding logs from the cutting area to the landing.
1906  "I've been swamper, line-horse man and riggan-slinger for this layout for over 8 years an' now when a chanst comes along to get on hook-tender, they put on a bloomin' blue nose, who hasn't been on the coast over a year."
1943  . . . the line-horse days had gone beyond recall. . . .