Dak \Dak\ (d[add]k or d[aum]k), n. [Hind. [dsdot][=a]k.]
Post; mail; also, the mail or postal arrangements; -- spelt
also {dawk}, and {dauk}. [India]
[1913 Webster]
{Dak boat}, a mail boat. --Percy Smith.
{Dak bungalow}, a traveler's rest-house at the end of a dak
stage.
{To travel by dak}, to travel by relays of palanquins or
other carriage, as fast as the post along a road.