From movies/series

Question 1

Expression

An event has happened or a decision has been taken that cannot be changed

Answer 1

The die is cast

Question 2

to make something such as a deal or an agreement by which both sides get an advantage or a benefit

Answer 2

To strike a deal/bargain

Ex : These questions must be answered before a deal can be struck.

Question 3

1) an old-fashioned pen made from a bird’s feather
1a) a large feather from a bird
2) a long thin sharp object like a stick that grows from the body of porcupines and some other animals

Answer 3

a quill

Exemple : “This bird’s quills are large”