"Serious congestion" refers to a situation where there is a lot of overcrowding or blockage that causes a significant amount of traffic or movement to slow down or come to a halt. Full definition
Not only are newborn babies more likely to get sick or have serious congestion of the nose, they also lack the ability to get rid of that congestion themselves. (newkidscenter.com)
On top of that, the network faced serious congestion, with most transactions happening at a much slower rate. (investinblockchain.com)
But he said there should be a discussion about the need for emergency anchorages in the event of severe weather or serious congestion at the port. (hudsonvalleyone.com)