The term 'back drew a blank' is an idiom that means to be unable to remember or think of something. The crossword solutions for this term are 'erased, ' 'forgot, ' and 'ERASE.' Erased is a verb meaning to remove something completely, usually by rubbing or scraping it away. Forgot is a verb meaning to be unable to remember something. ERASE is also a verb meaning to remove something completely, usually by rubbing or scraping it away.