a line drawn underneath (especially under written matter) 同義詞:underline,
draw a line or lines underneath to call attention to 同義詞:underline,
give extra weight to (a communication); "Her gesture emphasized her words" 同義詞:underline, emphasize, emphasise,
百科解釋
The underscore [ _ ] (also called understrike, underbar, low line, underdash, underline, lower part of z or low dash) is a character that originally appeared on the typewriter and was primarily used to underline words. To produce an underlined word, the word was typed, the typewriter carriage was moved back to the beginning of the word, and the word was overtyped with the underscore character.