Sentence:  A typewriter once put me in such evil temper that I threw it out a second-floor window. . . . Replacing it cost $100 or so—a small price to pay for the pleasure of <WSD>showing</WSD> a machine <WSD>who's boss</WSD>. 
Meaning of the word marked with <WSD> tags:  To demonstrate that one is dominant over or superior to someone; to establish that one has control of some device or intractable object.