A more thorough explanation:

Definition: To apply to a court for the issuance of a court order or writ.

Example 1: John decided to sue out a restraining order against his ex-girlfriend.

Example 2: The company's lawyer advised them to sue out a writ of injunction to prevent their competitor from using their patented technology.

These examples illustrate how "sue out" is used to describe the act of applying to a court for a specific legal action, such as a restraining order or writ of injunction. The term "sue out" is often used in legal contexts and may not be familiar to those outside of the legal profession.