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to vent one's spleen
01
to verbally or physically attack someone or something when one is angry about someone or something else
The phrase "vent one's spleen" originates from ancient Greek and Roman medical theories known as humorism. According to this theory, the spleen was believed to be the organ responsible for producing and storing black bile, one of the four humors or bodily fluids. This idiom may be used in various occasions, such as during heated debates, arguments, or discussions where individuals passionately express their discontent or dissatisfaction. It can also be used in personal settings, such as venting frustrations to a trusted friend or family member, or even in written form, like venting through social media posts or blog entries.
Example
Peter vented his spleen on his car by kicking it when it broke down.
Jack vented his spleen at his wife whenever things went badly at work.
Mom's been venting her spleen to me for an hour already.
I listened patiently while she vented her spleen.
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