blank check
[noun]
Synonyms: carte blanche, free hand

[TahlilGaran] English Synonym Dictionary ▲

ˌblank ˈcheque British English, ˌblank ˈcheck American English noun [countable]

1. a cheque that has been signed, but has not had the amount written on it

2. give somebody a blank cheque British English, give somebody a blank check American English to give someone permission to do whatever they think is necessary in a particular situation

[TahlilGaran] Dictionary of Contemporary English ▲

blank check
n.
1. A bank check written to a person who can then write in how much money he wants.
John's father sent him a blank check to pay his school bills.
2. informal Permission to another person to do anything he decides to do.
The teacher gave the pupils a blank check to plan the picnic.

[TahlilGaran] English Idioms Dictionary ▲