To notch, as a sword or knife.
To make an opening in; to breach.
To check the size of a gap.
I gapped all the spark plugs in my car, but then realized I had used the wrong manual and had made them too small.
To leave suddenly.
A type of ellipsis that occurs in the non-initial conjuncts of coordinate structures, and usually elides minimally a finite verb and further any non-finite verbs that are present. Example: "Some ate bread, and others rice."
The formation of a gap.