The Collaborative International Dictionary of English v.0.48:

Carouse \Ca*rouse"\, v. i. [imp. & p. p. Caroused; p. pr. &
   vb. n. Carousing.]
   To drink deeply or freely in compliment; to take part in a
   carousal; to engage in drunken revels.
   [1913 Webster]

         He had been aboard, carousing to his mates. --Shak.
   [1913 Webster]