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The drawing or printing of lines over or above a piece of text, mathematical symbol, etc.
Mid 19th century; earliest use found in American Whig Review. From over- + lining, perhaps after underlining.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。