Leave no stone unturned

Leave no stone unturned is an idiom that dates to ancient times. 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 English language in […]
from Grammarist
https://grammarist.com/idiom/leave-no-stone-unturned/