blank cheque
(a) signed cheque with the amount to be paid left blank, for the payee to write in (由受款人自行填写金额的)空白支票.
(b) (fig 比喻) complete authority to do sth 对某事可全权处理
The architect was given/presented with a blank cheque to design a new city centre. 设计师被授予全权设计一个新的城市中心区.