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]

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "careen":
   ascend, bank, blunder, bob, bobble, cant, capsize, career, climb,
   coggle, come a cropper, culbuter, dangle, decline, descend, dip,
   drop, fall, fall away, fall down, fall flat, fall headlong,
   fall off, fall over, fall prostrate, falter, flounce, flounder,
   fluctuate, flutter, get a cropper, go downhill, go uphill, grade,
   heel, incline, keel, keel over, labor, lay down, lean, librate,
   lie along, list, lurch, nutate, oscillate, overset, overthrow,
   overturn, pendulate, pitch, pitch and plunge, plunge, rake, reel,
   resonate, retreat, rise, rock, roll, seethe, shake, shelve, sidle,
   slant, slope, sprawl, spread-eagle, stagger, struggle, stumble,
   subvert, swag, sway, swerve, swing, swinging, take a fall,
   take a flop, take a header, take a pratfall, take a spill,
   thrash about, tilt, tip, tip over, topple, topple down,
   topple over, topsy-turvify, topsy-turvy, toss, toss and tumble,
   toss and turn, totter, trip, tumble, turn a somersault, turn over,
   turn topsy-turvy, turn turtle, turn upside down, uprise, upset,
   upturn, vacillate, veer, vibrate, volutation, wag, waggle, wallop,
   wallow, wave, waver, weave, welter, wobble