snarl

(Of an animal or person) make an aggressive, guttural sound, showing teeth.

"The dog snarled at the postman."

A tangled mass or a confused, complicated situation, especially traffic.

"The traffic snarl caused long delays."

Become or cause to become tangled and messy, often obstructing movement.

"The fishing line began to snarl."

An aggressive, guttural sound made by an animal or person.

"We heard a low snarl."