1. past tense and past participle of ravel; became tangled or confused
2. past tense and past participle of ravel; became frayed or unraveled at the edges

Examples

• The yarn had ravelled into a hopeless knot.
• Her sweater ravelled at the cuffs after years of wear.
• The rope ravelled when it got caught in the machinery.
• The fabric ravelled along the cut edge.
• His thoughts had ravelled into confusion.
• The old blanket ravelled where the cat had clawed it.