to act recklessly; to fly in the face of convention; to go against the tide
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Uses:
Betsy smiled with her eyes, and looked intently at Anna. "It's a new manner," she said. "They've all adopted that manner. They've flung their caps over the windmills. But there are ways and ways of flinging them."
"Yes, but what are her relations precisely with Kaluzhsky?"
Leo Tolstoy. Anna Karenina (Translated by Constance Garnett)