I've never heard of overshoot of a sine wave. Usually overshoot applies to square waves or signal level transitions. For example, when a signal rises from 0 volts to 5 volts, it may overshoot the 5 volt mark slightly and then come back down to 5 volts. Sometimes it will overshoot (5.1 volts) then undershoot (4.95 volts), then repeat until it gets closer and closer to 5 volts, until it finally settles at 5 volts. This is called ringing. These terms only apply to square waves and level transitions. A sine wave is a smooth curve. An overshoot would just be a higher peak to peak amplitude, and it would not be called overshoot.