To exercise, employ, make use of, the sense of smell in relation to a specified object. Const. at, of (now U.S.), †on, or to (†unto).

Without const. To possess or exercise the sense of smell; to be able to perceive odours, or to be engaged in doing this. Also figurative.

intransitive and transitive. To snuff or smell; to go snuffing or smelling (at); to poke about with the nose. Also figurative, to sneak about, to…

To exhale or emit the odour of, to have the smell of, something. Also rarely on (now dialect).

To draw air, etc., into the nostrils by an effort of inhalation; to do this in order to smell something. Also const. after, at.

To draw air into the nostrils in order to smell something; to snuff or smell at a thing.

To inhale, sniff; also intransitive to smell, sniff.

To sniff in smelling; to smell with a sniff or sniffs. Said esp. of animals.

intransitive. literal. Esp. of an animal: to use or apply the nose in smelling; to search for using the nose; to sniff, to smell.

transitive. Of the nose or snout (or of something likened to a snout, as the muzzle of a gun, etc.): to press against. Also intransitive with…

intransitive. To smell, sniff.

intransitive. Of a dog: To sniff or poke with the nose.