Idiom
Will o' the wisp

To act in a foolish way
Anything which eludes or deceives
To have desires unbacked by efforts
To act in a childish way

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Idiom
To cast pearls before a swine

To waste money over trifles
To spend a lot of money on the unkeep of domestic hogs
To spend recklessly
To offer a person a thing which he cannot appreciate

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