verb (v)

• recognize or detect by or as if by smelling(verb.perception)

  Example:
  He can smell out trouble.
  

  Synonym:
  nose out, scent out, sniff out
  

  source: wordnet30
• become aware of not through the senses but instinctively(verb.cognition)

  Example:
  Smell out corruption.
  

  Synonym:
  sense, smell
  

  source: wordnet30