To leave or depart in a haughty or self-satisfied manner, often after achieving one's goal or having the last word.
大模大样地径自走了。
清·曹雪芹《红楼梦》第十二回（道士）道‘……千万不可照正面，只照背面，要紧，要紧！三日后我来收取，管叫你病好。’说毕，徉长而去。”
After winning the argument, he turned around and walked away, leaving everyone speechless.
Learn the next connected idiom: 扬长而去 (yáng cháng ér qù) → 去伪存真 (qù wěi cún zhēn)
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