Definition of smells:
(n) :
A sensation, pleasant or unpleasant, detected by inhaling air (or, the case of water-breathing animals, water) carrying airborne molecules of a substance.
(n) :
(physiology) The sense that detects odours.
(v) :
(transitive) To sense a smell or smells.
(v) :
(intransitive, copulative) Followed by like or of if descriptive: to have a particular smell, whether good or bad.
(v) :
(intransitive, without a modifier) To smell bad; to stink.
(n) :
A conclusion or intuition that a situation is wrong, more complex than it seems, or otherwise inappropriate.