A more thorough explanation:

Definition: Irrevocable means that something cannot be changed or undone. It is final and cannot be taken back.

Example 1: A contract that is signed and agreed upon by both parties is usually irrevocable. Once it is signed, it cannot be changed or cancelled without the agreement of both parties.

Example 2: A decision to have surgery is often irrevocable. Once the surgery is done, it cannot be undone. The person must live with the consequences of the surgery.

Explanation: The examples illustrate that once something is irrevocable, it cannot be changed or undone. In example 1, the contract is a legal agreement that both parties have committed to, and it cannot be changed without both parties agreeing. In example 2, the decision to have surgery is a personal choice that cannot be reversed once it is done. Both examples show that irrevocable means that something is final and cannot be taken back.