In an airplane, it's a maneuver you do when your brakes fail and you are about to go off the end of the runway. You put a wingtip in contact with the ground and the plane spins out and stops quite quickly with little damage.
In audio, it refers to the circuitry being grounded at more than one place in the circuit...say at the phono preamp and again at the power amp. The circuit and the two grounds form a closed loop. Because the ground potential is probably different at the two (or more) places that are grounded the result will be hum.
In audio, it refers to the circuitry being grounded at more than one place in the circuit...say at the phono preamp and again at the power amp. The circuit and the two grounds form a closed loop. Because the ground potential is probably different at the two (or more) places that are grounded the result will be hum.