blank check (US) or Brit blank cheque noun
plural ∼ checks [count] 1 : a signed check that does not have the amount of money written on it yet 2 informal : complete control or freedom — often used in the phrase give/hand (someone) a blank check ▪ The director had a lot of creative freedom on this project; the film's backers essentially handed him a blank check. [=let him direct the film exactly the way he wanted to]
