Something that is blank has nothing on it.
A blank is a space which is left in a piece of writing or on a printed form for you to fill in particular information.
If you look blank, your face shows no feeling, understanding, or interest.
If your mind or memory is a blank, you cannot think of anything or remember anything.
Blanks are gun cartridges which contain explosive but do not contain a bullet, so that they cause no harm when the gun is fired.
6. see also: point-blank
If you draw a blank when you are looking for someone or something, you do not succeed in finding them.
If your mind goes blank, you are suddenly unable to think of anything appropriate to say, for example in reply to a question.