sniffle

Concise Oxford English Dictionary © 2008 Oxford University Press:
sniffle/ˈsnɪfl/

▶verb sniff slightly or repeatedly, typically because of a cold or fit of crying. ▶noun

• 1 an act of sniffling.

• 2 a slight head cold.

– derivatives
sniffler noun,
sniffly adjective.

– origin C17: imitative.