to intentionally cover over something that is written so that it cannot be read

Some of the names in the report have been blanked out. 报告中有些名字已经被抹掉了。

to stop yourself thinking about a memory because it is unpleasant and you would prefer not to remember it

There may be a traumatic incident in your past that you have blanked out. 过去你可能经历过创伤，而你已经从记忆中抹去了。