Source : Webster's Revised Unabridged Dictionary (1913)

Tumble-down \Tum"ble-down`\, a.
   Ready to fall; dilapidated; ruinous; as, a tumble-down house.
   [Colloq.]

Source : WordNet®

tumble-down
     adj : in deplorable condition; "a street of bedraggled tenements";
           "a broken-down fence"; "a ramshackle old pier"; "a
           tumble-down shack" [syn: {bedraggled}, {broken-down}, {dilapidated},
            {ramshackle}, {tatterdemalion}, {unsound}]