Definitions

1. verb

to breathe in and out quickly through the nose in order to smell something

“She sniffed the air to see if she could smell the freshly baked cookies.”

2. verb

to investigate or examine something, especially secretly

“He sniffed out the source of the leak in the office’s water pipes.”

3. noun

a sudden, quick inhalation through the nose

“The sniff was a sign that the dog was about to sneeze.”

4. noun

a sudden feeling or impression, especially a good one

“The sniff of excitement was evident on her face as she heard the news.”