To sign sharp, hold out your non-dominant hand flat, with fingers together and palm facing down. Then take the middle finger of your dominant hand and slide it from the top of your other hand to the end of your middle finger, as if cutting it with a knife.
Sharp is signed a bit like touch, so be careful not to get these signs confused.
Teaching our babies to sign sharp is important, as it relates to their personal safety. Introduce your baby to the concept by showing them needles and explaining the hazards of knives and scissors.
Babies are full of curiosity, and they will soon figure out that Mom and Dad often use sharp and possibly dangerous objects. Teach the sign as a warning to make sure your baby is aware of danger ahead of time.