Definition of Sniff

Sniff

1. To draw air audibly up the nose; to snuff; -- sometimes done as a gesture of suspicion, offense, or contempt.
2. To draw in with the breath through the nose; as, to sniff the air of the country.
3. To perceive as by sniffing; to snuff, to scent; to smell; as, to sniff danger.
4. The act of sniffing; perception by sniffing; that which is taken by sniffing; as, a sniff of air.