If there is congestion in a place, the place is extremely crowded and blocked with traffic or people.
近义词
crowding , overcrowding
双语例句
例： The problems of traffic congestion will not disappear in a hurry.
交通堵塞问题不会很快消失。
例： Energy consumption, congestion and pollution have increased.
能源消耗、交通堵塞及污染问题变得更为严重了。