1 if an animal snarls, it makes a low angry sound and shows its teeth
snarl at
The dog growled and snarled at me.

2 to speak or say something in a nasty, angry way:
'Shut up,' he snarled.

3 also snarl up British English to prevent traffic from moving:
Traffic snarled up on both sides of the road.

—snarl noun [countable]
an angry snarl