a cheque that has been signed but does not have an amount of money written on it, so that it can be exchanged for whatever amount is entered空白支票;未填金额的签名支票
mainly journalismcomplete freedom and authority to spend as much money as you want on something. This is usually used when you do not think this should happen. 给某人一张空白的签名支票(通常用来表示认为这种事不应该发生)