Idiom
A snake in the grass

Unforeseen happening
Irreliable person
Secret or hidden enemy
Unrecognisable danger

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Idiom
To be above board

To have a good height
They have no debts
None of these
To try to be beautiful
To be honest in any business deal

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Idiom
To smell a rat

To get bad small of a bad dead rat
To suspect foul dealings
To be in a bad mood
None of these
To see signs of plague epidemic

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