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原形容梁代画家张僧繇作画的神妙。后多比喻写文章或讲话时，在关键处用几句话点明实质，使内容生动有力。
[add the touch that brings a work of art to life;add a word or two to clinch the point;put life into sth.like dotting the eyeball in painting a dragon] 以唐·张彦远《历代名画记》所述张繇僧画龙点睛的故事,比喻绘画、作文在紧要之处加上一笔,使其灵活而有神
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