Sniff

·vt To draw in with the breath through the nose; as, to sniff the air of the country.

II. Sniff ·noun The act of sniffing; perception by sniffing; that which is taken by sniffing; as, a sniff of air.

III. Sniff ·vt To perceive as by sniffing; to snuff, to scent; to Smell; as, to sniff danger.

IV. Sniff ·vt To draw air audibly up the nose; to Snuff;

— sometimes done as a gesture of suspicion, offense, or contempt.