the devil is in the detail
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the devil is in the detail(s)
proverb Plans, actions, or situations that seem sound must be carefully examined, because minor details can end up causing major, unforeseen problems. Double check your code—with software, the devil is in the details.
See also: devil
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
the ˌdevil is in the ˈdetail(s)used to say that it is the small individual parts of a task, a written document, a design, etc. that may cause most problems and difficulties: In any negotiation, the devil is in the detail.
Farlex Partner Idioms Dictionary © Farlex 2017