* The dog growled at the stranger, baring its teeth. (This shows a dog expressing aggression.)
* The engine growled to life as the car sped away. (This uses "growl" to describe a mechanical sound.)
* The lion growled deeply in its throat, a warning to any nearby animals. (This is a more figurative use of "growl," describing a sound that conveys a warning.)
* The politician's growl could be heard across the room, as he delivered his speech. (This uses "growl" to describe a person's voice, often used to convey anger or authority.)
* She growled with frustration when she realized she had forgotten her keys. (This uses "growl" to describe a person's sound of displeasure.)
Remember, the context of your sentence will determine the best way to use "growl." You can use it to describe animal sounds, mechanical sounds, or even human voices and emotions.