Idiom
A snake in the grass

Irreliable person
Unrecognisable danger
Secret or hidden enemy
Unforeseen happening

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Idiom
Madhuri might scream blue murder, but I feel Deepali should get the promotion since she is better qualified for the job.

Make a great deal of noise and object vehemently
Someone has been murdered with some blue liquid
Suffer from persecution complex
Someone is being murdered and has become blue

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