是cross out的ing形式.
cross out [k r os][aut]
v 删去 注销
【柯林斯解释】If you cross out words on a page, you draw a line
through them, because they are wrong or because you want to change them
如果你把纸上的词语cross out了,也就是指你在上面划了一道线,因为它们是错的,或者你想要换掉它们.
eg：
Two sentences were crossed out.
两句话被删掉了.