1 to remove the knots from a piece of string, thread, etc; to come unfastened in this way 解开，拆去（绳、线等上的结子）；（结子）松开，散开 · I unravelled the tangled string and wound it into a ball. 我把纠结在一起的绳子解开，卷成一团。

2 (used about a complicated story, etc) to become or to make sth become clear （指情节复杂的故事等）变清楚，解开（谜团）