An oscillator is a device that creates a regular, often periodic, motion, so here the metaphor suggests that the oscillator is never satisfied or content with staying on one frequency, but is always searching for the right frequency.
Consider the staetement "Oscillators never stay on one frequency, they are always searching around to find the right frequency and go up and down.". Based on this statement, is "The oscillator hunts about the correct frequency." a true statement? Yes/no/unknown