Simple past and past participle of pin.

Fastened or attached with a pin.

• Securely held in place.

Kept at the top or always visible in an app or chat.

• Marked to persist.

Held down and restrained by force.

• In wrestling, shoulders fixed to the mat.

In chess, unable to move without exposing a more valuable piece or the king.

Fixed in memory or configuration to prevent movement or change.

• E.g., pinned memory or certificate.

Of an analog gauge, needle pressed against the stop at maximum.