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unravel

verb
     
un‧rav‧el past tense and past participle unravelled, present participle unravelling British English, past tense and past participle unraveled, present participle unraveling American English
1 [transitive] to understand or explain something that is mysterious or complicated:
Detectives are still trying to unravel the mystery surrounding his death.
2 [intransitive and transitive] if you unravel threads, string etc, or if they unravel, they stop being twisted together
3 [intransitive] if a system, plan, organization etc unravels, it starts to fail:
The company started to unravel when two of the directors were arrested.

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