(transitive) To unfasten by removing a pin.

(transitive, computing, graphical user interface) To detach (an icon, application, etc.) from the place where it was previously pinned.

(programming, transitive) To undo the pinning or fixing of (an array in memory, a security certificate, etc.) so that it can be modified again.

(transitive, chess) To get (a piece) out of a pin.