emergency, exigency, pinch -- (a sudden unforeseen crisis (usually involving danger) that requires immediate action; "he never knew what to do in an emergency")
top, pinch -- (cut the top off; "top trees and bushes")
pinch, vellicate -- (irritate as if by a nip, pinch, or tear; "smooth surfaces can vellicate the teeth"; "the pain is as if sharp points pinch your back")