%subvene%

v. i. [ imp. & p. p. Subvened p. pr. & vb. n. Subvening. ] [ Pref. sub- + L. venire to come. See Subvention. ] To come under, as a support or stay; to happen. [ 1913 Webster ]

A future state must needs subvene to prevent the whole edifice from falling into ruin. Bp. Warburton. [ 1913 Webster ]