A light at the end of the tunnel

A light at the end of the tunnel is an idiom that dates back at least to the 1880s. 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 […]
from Grammarist
https://grammarist.com/idiom/a-light-at-the-end-of-the-tunnel/