A slight smell carried on a current of air. I caught a whiff of fresh bread as I walked past the bakery.
A brief or faint experience or indication of something. There was a whiff of scandal surrounding the politician's sudden resignation.
An unsuccessful attempt to hit something, especially in sports. The batter took a big swing but ended up with a whiff, missing the ball completely.
A small puff or gust of air, smoke, or vapor. A whiff of smoke drifted from the dying campfire.