This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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To make an angry protest against a relatively minor problem, in the process embarrassing the protester. The analogy is with a baby who throws toys out of the pram in order to get their parent to pay attention to them. The implication in the idiom is that the protester is acting like a baby.