Idiom
Something up one's sleeve.

A secret plan
A profitable plan
Something important
A grand idea

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Idiom
To be above board

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

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Idiom
To split hours

T quarrel over trifles
To find faults with others
To sidetrack the issue
To indulge in over-refined arguments

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