To behave, in a management capacity, in a manner which is inept, incompetent, or dishonest.
To manage an area of responsibility in a way which is inept, incompetent, or dishonest.
To regulate, adjust or adapt
To change the pitch, intensity or tone of one's voice or of a musical instrument
to vary the amplitude, frequency or phase of a carrier wave in proportion to the amplitude etc of a source wave (such as speech or music)
to move from one key or tonality to another, especially by using a chord progression