When someone has the sniffles, they have a runny or stuffy nose, usually because of a cold.
Having the sniffles is not very serious, but it can be uncomfortable.
Examples:
She has the sniffles and needs a tissue.
I don't like having the sniffles because it makes it hard to breathe.
The little boy's sniffles went away after he rested.
The sniffles always make me sound funny when I talk.
Her sniffles were so bad, she went through a whole box of tissues in one day.
I had the sniffles for a whole week, but then I got better.