An itch in your nose makes you want to sniff.
When you need some fresh air or are curious about something, you might put your nose up close and take a little snuff - that's what we call it when you sniff. You can sniff out food if you're hungry and walking through the kitchen, looking for something tasty to eat. If someone is being sneaky or hiding something, you might sniff around to figure out what they're doing. And of course, your nose gets a bit tickly and needs some snuff when you have allergies - that's usually during spring and fall seasons, but it can happen at any time.
An instance of sniffing.
Example: She gave the flowers a quick sniff to check they were real.
To make a short, audible inhalation, through the nose, as when smelling something.
Example: I sniffed the meat to see whether it had gone off.
A short inhalation sound, sometimes associated with crying.
