Question

What is the meaning of regret?​

Answer 1

Answer:

a feeling of sorrow or remorse for a fault, act, loss, disappointment, etc. regrets, a polite, usually formal refusal of an invitation: I sent her my regrets. a note expressing regret at one's inability to accept an invitation: I have had four acceptances and one regret.

Answer 2

Regret means disappointment, which is caused by something that has happened or something that you have done or not done.

Mistake

and understand the real mistake you done.