"sniffing" in the verb sense
1. sniff, whiff
perceive by inhaling through the nose
"sniff the perfume"
2. sniff, sniffle
inhale audibly through the nose
"the sick student was sniffling in the back row"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License