Forcibly, sometimes mutedly, expelling air from one's lungs, sometimes to clear mucus, sometimes to attract attention to something; less vigorous than coughing.
To make a whimpering or sniffing sound when breathing, because of a runny nose.
To utter with a whimpering or sniffing sound.
The act, or the sound of sniffling; the condition of having a runny or wet nose, as from a cold or allergies.