1. pinning
1. 定位：pink 粉红 | pinning 定位 | pinwheel 旋转风车
2. 锁住：pinhole camera 针孔照相机 | pinning 锁住 | pinning center 锁住中心
3. pinning
3. 阻塞：pinnacle 尖礁 | pinning 阻塞 | pinpet 滴管
noun
1. 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