An instance of sniffing.

“She gave the flowers a quick sniff to check they were real.”

A quantity of something that is inhaled through the nose

A brief perception, or tiny amount.

To make a short, audible inhalation, through the nose, as when smelling something.

“I sniffed the meat to see whether it had gone off.”

To say something while sniffing, for example in case of illness or unhappiness, or in contempt.

“"He's never coming back, is he?" she sniffed while looking at a picture of him.”

To perceive vaguely

“I can sniff trouble coming from the basement.”

A short inhalation sound, sometimes associated with crying.