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

 

sniff out

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    sniff somebody/somethingout

     
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  1. 1to discover or find someone or something by using your sense of smell The dogs are trained to sniff out drugs.
  2. 2(informal) to discover or find someone or something by looking Journalists are good at sniffing out a scandal.
See the Oxford Advanced Learner's Dictionary entry: sniff out