To achieve great success or wealth but choose not to display it; to keep one's accomplishments or prosperity private from others.
他虽然在外面取得了很大的成就，但他从不炫耀，总是默默地帮助家乡，真是衣锦夜行。
Although he achieved great success elsewhere, he never showed off, always quietly helping his hometown; truly keeping his achievements private.
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