sniff out

from WordNet (r) 3.0 (2006)

sniff out
    v 1: recognize or detect by or as if by smelling; "He can smell
         out trouble" [syn: {sniff out}, {scent out}, {smell out},
         {nose out}]

from Moby Thesaurus II by Grady Ward, 1.0

23 Moby Thesaurus words for "sniff out":
      be warm, burn, follow, follow a clue, follow up, get wind of,
      hunt down, nose, nose out, run down, run to earth, scent, shadow,
      smell, smell out, sniff, stalk, tail, trace, trace down, track,
      track down, trail

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