col-lăbĕfacto (conl-), āre, v. a.,
to make to reel , shake , or totter (perh. only in the two foll. exs.): motu collabefactat onus, Ov. F. 1, 566.—Poet. of liquefying metals: rigorem auri, to overpower , subdue , Lucr. 1, 493; cf. collabefio.
con-labefactō (coll-) —, —, āre, to convulse, break down: vastum onus (montis), O. ...
An Elementary Latin Dictionary