A more thorough explanation:

Definition:

Bring an action: To start a legal case by suing someone or instituting legal proceedings.

Examples:

• John decided to bring an action against his former employer for wrongful termination.
• The company threatened to bring an action against the contractor for breach of contract.

Explanation: When someone brings an action, they are initiating a legal case against someone else. This can happen when someone feels they have been wronged or when there is a dispute that cannot be resolved outside of court. In the first example, John believes he was unfairly fired from his job and is taking legal action against his former employer. In the second example, the company is considering taking legal action against a contractor who did not fulfill their contractual obligations.