(ravelled, ravelling; <美> raveled, raveling) with obj.
1
ravel something out
untangle something解开…的纠结; 理出…的头绪, 弄明白; 解决; 使不再紊乱：Davy had finished ravelling out his herring net
戴维已经解开鲱鱼网的缠结
figurative 〈喻〉sleep ravelled out the tangles of his mind.
睡眠使他紊乱的思绪恢复了平静。
2
- confuse or complicate (a question or situation)使（问题, 情形）混乱, 使（问题, 情形）错综复杂; 使纠缠, 使纠结。
- rare a tangle, cluster, or knot〈罕〉纠结; 串, 丛, 簇; 结：
a lovely yellow ravel of sunflowers.
一簇可爱的黄色向日葵。
词源
late Middle English （in the sense 'entangle, confuse'）： probably from Dutch ravelen 'fray out, tangle'.