noun
a quick inhalation through the nose, especially to detect a smell
verb
to inhale through the nose audibly, as a dog does when it smells something
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The detective sniffed the air for any traces of the suspect's scent.
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I saw the dog sniffing around the bushes in the park.
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She sniffed out the best deals at the thrift store.
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He could sniff out a lie from a mile away.