Definition of ferret out phrasal verb from the Oxford Advanced American Dictionary

 

ferret out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

ferret somebody/somethingout

(informal)
 
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to discover information or to find someone or something by searching thoroughly, asking a lot of questions, etc. He is determined to ferret out the truth about what happened.
See the Oxford Advanced Learner's Dictionary entry: ferret out