A more thorough explanation:

Definition: A motion for leave to appeal is a request made to an appellate court to review an interlocutory order that meets the standards of the collateral-order doctrine. It is abbreviated as MLA. The collateral-order doctrine allows an appeal of an order that is separate from the main case and cannot be effectively reviewed after the final judgment.

Example: A defendant in a criminal case may file a motion for leave to appeal if the trial court denies their motion to suppress evidence. The defendant can argue that the order denying the motion to suppress is a collateral order that meets the standards of the collateral-order doctrine. If the appellate court grants the motion for leave to appeal, they will review the order denying the motion to suppress before the trial proceeds.

Explanation: The example illustrates how a defendant in a criminal case can use a motion for leave to appeal to challenge an interlocutory order that meets the standards of the collateral-order doctrine. The defendant argues that the order denying the motion to suppress is a separate issue that cannot be effectively reviewed after the final judgment. If the appellate court agrees, they will review the order before the trial proceeds.