As a verb:
* The dog snarled at the mailman, baring its teeth.
* The politician snarled insults at his opponent during the debate.
* The traffic jam made me snarl with frustration.
As a noun:
* The snarl of traffic on the freeway was intense.
* The dog's snarl was enough to make anyone back away.
* There was a snarl of anger in his voice.
In figurative language:
* The snarl of the city never sleeps.
* The snarl of war echoed across the land.
Remember that "snarl" can have both a literal and figurative meaning, so the context will determine which one is intended.