Source : Webster's Revised Unabridged Dictionary (1913)

Congest \Con*gest"\, v. t. [L. congestus, p. p. of congere to
   bring together; con- + gerere. See {Gerund}.]
   1. To collect or gather into a mass or aggregate; to bring
      together; to accumulate.

            To what will thy congested guilt amount?
                                                  --Blackmore.

   2. (Med.) To cause an overfullness of the blood vessels (esp.
      the capillaries) of an organ or part.

Source : WordNet®

congest
     v : become or cause to become obstructed; "The leaves clog our
         drains in the Fall"; "The water pipe is backed up" [syn:
         {clog}, {choke off}, {clog up}, {back up}, {choke}, {foul}]
         [ant: {unclog}]