Low-key and lowkey

Low-key and lowkey are idioms with similar meanings, but are different parts of speech. An idiom is a commonly used word, group of words, or phrase that has a figurative meaning that is not easily deduced from its literal definition. Often using descriptive imagery or metaphors, common idioms are words and phrases used in the […]
from Grammarist
https://grammarist.com/idiom/low-key-and-lowkey/