noun
a word that can be the subject or object of a verb, the object of a preposition, or the subject of a sentence
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Before purchasing any food product, it is important to do the sniff test to ensure its freshness.
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I always give leftovers the sniff test before deciding whether to eat them or not.
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Dude, just give it the sniff test before you decide if it's worth keeping.
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She always uses the sniff test when meeting new people to gauge their intentions.