The act, or the sound of sniffling; the condition of having a runny or wet nose, as from a cold or allergies.
I sometimes have a sniffle during allergy season.
To make a whimpering or sniffing sound when breathing, because of a runny nose.
Sonia sniffled a little, and her eyes were puffy and wet.
To utter with a whimpering or sniffing sound.
He sniffled a pathetic apology.