Verb has 2 senses

• smell out(v = verb.perception) nose out, scent out, sniff out - recognize or detect by or as if by smelling; "He can smell out trouble"

Sample sentences:
Somebody ----s somebody
Somebody ----s something

• smell out(v = verb.cognition) sense, smell - become aware of not through the senses but instinctively; "I sense his hostility"; "i smell trouble"; "smell out corruption"

Sample sentences:
Somebody ----s something
Somebody ----s that CLAUSE