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EnglishMerriam-Webster Dictionary

the difficult, deceptive, or problematic part of something //The devil is in the details.

Christian Science the opposite of Truth a belief in sin, sickness, and death evil, error

between the devil and the deep blue sea
faced with two equally objectionable alternatives
devil to pay
severe consequences —used with the //There'll be the devil to pay if we're late.
like the devil
- very much //These new shoes hurt like the devil.
- with great energy or speed