verb · to be nearly a certain age or to be close to danger

他已经六十岁擦边了，快要退休了。

verb · to be marginal in terms of relevance or legality; to operate in a grey area

这些直播内容经常在违规的边缘擦边。

verb · to make light contact with the edge of something

那颗球刚好擦边，落在了界内。