con·gest 
(kən-jĕst)
(kən-jĕst)v. con·gest·ed, con·gest·ing, con·gests
v.tr.
1. To overfill or overcrowd: Trucks congested the tunnel.
2. Medicine To cause the accumulation of excessive blood or tissue fluid in (a vessel or organ).
v.intr.
To become congested.
[Latin congerere, congest-, to heap up, crowd together : com-, com- + gerere, to carry.]
con·gestion n.
con·gestive adj.