underscore

1. V-T If something such as an action or an event underscores another, it draws attention to the other thing and emphasizes its importance. 突出显示; 强调[美国英语]

The Labour Department figures underscore the shaky state of the economic recovery. 劳工部的数字突出显示了经济复苏的不稳定。

2. V-T If you underscore something such as a word or a sentence, you draw a line underneath it in order to make people notice it or give it extra importance. 在…下面划线[美国英语]

He heavily underscored his note to Shelley. 他在写给谢利的短笺下重重地划了线。