The Collaborative International Dictionary of English v.0.48:

Careen \Ca*reen"\, v. t. [imp. & p. p. Careened; p. pr. & vb.
   n. Careening.] [OF. cariner, F. car['e]ner, fr. OF.
   car[`e]ne, the bottom of a ship, keel, fr. L. carina.]
   (Naut.)
   To cause (a vessel) to lean over so that she floats on one
   side, leaving the other side out of water and accessible for
   repairs below the water line; to case to be off the keel.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Careen \Ca*reen"\, v. i.
   To incline to one side, or lie over, as a ship when sailing
   on a wind; to be off the keel.
   [1913 Webster]

WordNet (r) 3.0 (2006):

careen
    n 1: pitching dangerously to one side [syn: rock, careen,
         sway, tilt]
    v 1: walk as if unable to control one's movements; "The drunken
         man staggered into the room" [syn: stagger, reel,
         keel, lurch, swag, careen]
    2: move sideways or in an unsteady way; "The ship careened out
       of control" [syn: careen, wobble, shift, tilt]