What does "blank" mean?

In addition to the idiom beginning with blank, also see draw a blank; fill in (the blanks).

See blank in WNW Idioms

blank out

to cancel or obscure by covering over; void

draw a blank

  1. to draw a lottery ticket that fails to win
  2. Informal
    1. to be unsuccessful in any attempt
    2. to be unable to remember a particular thing

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