devil (devils plural )
1 n-proper In Judaism, Christianity, and Islam, the Devil is the most powerful evil spirit.
the N
(=Satan)
2 n-count A devil is an evil spirit.
(=demon)
...the idea of angels with wings and devils with horns and hoofs.
3 n-count You can use devil to emphasize the way you feel about someone. For example, if you call someone a poor devil, you are saying that you feel sorry for them. You can call someone you are fond of but who sometimes annoys or irritates you an old devil or a little devil.
INFORMAL, feelings I felt sorry for Blake, poor devil...
4 If you say that you are between the devil and the deep blue sea, you mean that you are in a difficult situation where you have to choose between two equally unpleasant courses of action.
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between the devil and the deep blue sea phrase v-link PHR
5 People say speak of the devil, or in British English talk of the devil, if someone they have just been talking about appears unexpectedly.
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talk/speak of the devil phrase
Well, talk of the devil!
6 When you want to emphasize how annoyed or surprised you are, you can use an expression such as what the devil, how the devil, or why the devil.
INFORMAL
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what/how/why the devil phrase
(emphasis)
`What the devil's the matter?'