Source : Webster's Revised Unabridged Dictionary (1913)

Impend \Im*pend"\, v. t. [L. impend?re; pref. im- in + pend?re
   to weigh out, pay.]
   To pay. [Obs.] --Fabyan.

Impend \Im*pend"\, v. i. [imp. & p. p. {Impended}; p. pr. & vb.
   n. {Impending}.] [L. impend[=e]re; pref. im- in + pend[=e]re
   to hang. See {Pendant}.]
   To hang over; to be suspended above; to threaten frome near
   at hand; to menace; to be imminent. See {Imminent}.

         Destruction sure o'er all your heads impends. --Pope.

Source : WordNet®

impend
     v : be imminent or about to happen; "Changes are impending"