The monster growled loudly, scaring the children.
Meaning: This means that the monster made a scary sound that frightened the children.
Choice of Words: A Monster is a large, imaginary creature that is often scary or dangerous. Growled means made a deep, rough sound in the throat, like an angry animal. Loudly means with a lot of sound. Scaring means causing someone to feel fear. Children are young people. When you put them together, it means the monster made a loud, rough sound that caused the children to feel fear.
Alternative Expressions
Related Expressions