TO DISCUSS - [verb] to talk over or to write about sth

Examples of use

We are meeting today to discuss our problems.

The book discusses English literature.

TO AFFORD - [verb] to have money for; to be able to meet the expense of; to be able to give / spare sth

Examples of use

Our car is breaking all the time and we should buy a new one. Unfortunately we can't afford it now.

He won 1 million dollars last week! Now he can afford a trip wherever he wants!

MISTAKE - [noun] something incorrect

Examples of use

Marrying him was the biggest mistake of her life. He isn't the man she thought he was at the beginning.

There are some mistakes in your work. You need to learn more.