Congest (verb)

1. To cause to become blocked or filled with an excessive amount of something.
2. To cause an accumulation of fluid or blood in an organ or part of the body.
3. To cause an excessive build-up of traffic in an area.

Origin:

From latin congestus, past participle of congerere ("to heap u.p")

Examples:

1. The cold weather congested the pipes and caused a leak.
2. The city's narrow streets congested the traffic, causing delays.
3. The flu congested her lungs, making it hard for her to breathe.
4. The heavy rain congested the drainage system, causing flooding.
5. The factory's operations congested the air with pollution.