To overfill or overcrowd: Trucks congested the tunnel.
Pathology To cause the accumulation of excessive blood or tissue fluid in (a vessel or organ).
To become congested.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.