The Collaborative International Dictionary of English v.0.48:

Overset \O`ver*set"\, v. t. [imp. & p. p. Overset; p. pr. &
   vb. n. Oversetting. ]
   1. To turn or tip (anything) over from an upright, or a
      proper, position so that it lies upon its side or bottom
      upwards; to upset; as, to overset a chair, a coach, a
      ship, or a building. --Dryden.
      [1913 Webster]

   2. To cause to fall, or to fail; to subvert; to overthrow;
      as, to overset a government or a plot. --Addison.
      [1913 Webster]

   3. To fill too full. [Obs.] --Howell.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Overset \O`ver*set"\, v. i.
   To turn, or to be turned, over; to be upset. --Mortimer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Overset \O"ver*set`\, n.
   1. An upsetting; overturn; overthrow; as, the overset of a
      carriage.
      [1913 Webster]

   2. An excess; superfluity. [Obs.] "This overset of wealth and
      pomp. " --Bp. Burnel.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "overset":
   balance, be lost, bonus, capsizal, capsize, careen, culbute,
   culbuter, deck, dividend, extra, floor, founder, go down, gratuity,
   honeycomb, keel, keel over, knock over, lagniappe, leftover,
   margin, overage, overcome, overmaster, overmatch, overmeasure,
   overplus, overpower, overrun, overstock, oversupply, overthrow,
   overturn, pitchpole, plus, pourboire, remainder, revolution, sap,
   sap the foundations, scuttle, send flying, silence, sink,
   somersault, somerset, something extra, spare, spill, subversion,
   subvert, surmount, surplus, surplusage, throw down, throw over,
   tip, tip over, topple, topple over, topsy-turvify, topsy-turvy,
   trip, trip up, tumble, turn a somersault, turn over,
   turn topsy-turvy, turn turtle, turn upside down, turnover,
   undermine, unhorse, upend, upset, upset the boat, upturn, weaken