Answer:
A quagmire is literally a bog, swamp, or marshy area that is potentially dangerous (i.e one could become trapped or mired).
The word is used colloquially for a situation from which it is difficult to escape or extricate oneself.

"The office was a quagmire of interviews and paperwork."
"For the Soviets, the war in Afghanistan was a quagmire."
First answer by Sissons. Last edit by Dfoofnik. Contributor trust: 2560 [recommend contributor recommended]. Question popularity: 13 [recommend question].