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