Definition from macmillandictionary.com
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This room smells a bit damp.
a strong-smelling perfume
This milk smells off (=no longer fresh).
The laboratory smelled strongly of chemicals.
It smells like a bar in here.
His feet really smell.
Sasha could smell the sweet aroma of warm chocolate.
Do you smell gas?
Come and smell these roses.
I can’t smell at all with this cold.
I could just smell trouble in that club.
I can’t put my finger on it, but something about this deal really smells.