Marked with a line drawn underneath text to emphasize or highlight it. Also means emphasized or stressed in importance.
Compound of 'under' (beneath) and 'line' (a mark or stroke). The practice of underlining for emphasis developed with written texts, becoming standardized in typography and later adapted to word processing and digital text formatting.
Before bold and italic fonts were widely available, underlining was the primary way to emphasize text in typewritten documents! Interestingly, in digital writing, underlining has become almost synonymous with hyperlinks, showing how typography evolves with technology.
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