He upped and left without telling anyone.
他突然起身不辞而别。
《牛津词典》
What puzzles me is why he left the country without telling anyone.
令我不解的是，他为什么悄悄地离开了这个国家。
She sneaked away without telling anyone.
她没告诉任何人便悄悄溜走了。
youdao
Both family and police say Hall was not the type to go somewhere without telling anyone.
CNN: Honors student leaves doctor's office, disappears
Schultz signs off on handling the matter without telling anyone on the outside, at least for the time being.
CNN: STORY HIGHLIGHTS
He was raising money for leukemia research without telling anyone his home village had no running water or electricity.
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