It is an expression used by "skipping, ignoring something that should be noticed", can be deliberate or by a distraction, although today it is used more for the latter case. Probably the original phrase was "to pass (something) on the top" ( "it passed him over and didn't even see it" , "he skipn it" ).
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
