knife [knifed, knifing, knifes](to use a knife to injure or kill) verb [UK: naɪf] [US: ˈnaɪf]
stab [stabbed, stabbing, stabs](to pierce or wound with pointed object) verb [UK: stæb] [US: ˈstæb]It was John who stabbed Mary. = Fue Johnás quién acuchilló a María.