Idiom
The curious neighbours were disappointed as the young couple's quarrel was just a storm in a teacup.

brittle situation
violent quarrel
fuss about a trifle
quarrel about tea cups

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Idiom
To cast pearls before a swine

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

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