Naut. either of the two duty periods (from 4 to 6 P.M. and from 6 to 8 P.M.) that are half the length of a normal period
- Nautical Either of two short periods of watch duty, from 4 to 6 PM or 6 to 8 PM.
- A late night shift.
Origin of dogwatchProbably from dog-sleep, a light or interrupted sleep.