pinning
名词 pinning:
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
动词 pin:
to hold fast or prevent from moving
同义词:trap, pin, immobilize, immobilise
attach or fasten with pins
同义词:pin
pierce with a pin
同义词:pin
immobilize a piece
同义词:pin