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Phrase(s): The darkest hour is just before the dawn. [and] It’s always darkest just before the dawn.
Prov. When things are extremely bad, it may signal that they are about to get much better. • Jill: I feel like giving up. I don’t have a job, my boyfriend left me, and they’re raising the rent for my apartment. Jane: It’s always darkest just before the dawn.
McGrawhill's American Idioms And Phrasal Verbs