S: (v) pink, ping, knock (sound like a car engine that is firing too early) "the car pinged when I put in low-octane gasoline"; "The car pinked when the ignition was too far retarded"
S: (v) ping (make a short high-pitched sound) "the bullet pinged when they struck the car"
S: (v) ping (contact, usually in order to remind of something) "I'll ping my accountant--April 15 is nearing"
S: (v) ping (send a message from one computer to another to check whether it is reachable and active) "ping your machine in the office"