an area of soft, wet ground that you sink into if you try to walk on it

At the end of the game, the pitch was a real quagmire. 在比赛最后阶段，场地变得一片泥泞。

a difficult and dangerous situation

Since the coup, the country has sunk deeper into a quagmire of violence and lawlessness. 自政变以来，该国越来越陷入了一种暴力肆虐、法律缺失的境地。