If someone snivels, they cry and make a sound like they are sniffing.
Snivelling can make people think of someone being weak or whiny.
Examples:
She snivelled when she fell down.
The little boy snivelled after he lost his toy.
He snivelled loudly and wiped his nose.
Stop snivelling and be brave!
The big tough guy snivelled like a baby.
She snivelled and snivelled until her mom gave her a hug.