pinning

(noun) a mutual promise of a couple not to date anyone else; on college campuses it was once signaled by the giving of a fraternity pin.

(verb) to hold fast or prevent from moving. Synonyms: trap, pin, immobilize, immobilise. Example: "The child was pinned under the fallen tree."

(verb) attach or fasten with pins or as if with pins. Synonyms: pin. Example: "Pin the needle to the shirt". "pin the blame on the innocent man."

(verb) pierce with a pin. Synonyms: pin. Example: "Pin down the butterfly."

(verb) immobilize a piece. Synonyms: pin.