[with obj.]draw a line under (a word or phrase) to give emphasis or indicate special type 画线于…下 ■emphasize (something) 强调;突出 the improvement in retail sales was underlined by these figures. 这些数字突出了零售量的增加。
noun
a line drawn under a word or phrase, especially for emphasis (尤指为强调)下划线
the line of the lower part of an animal's body (动物)下体轮廓