Sentence:  "Ah!" sighs the little widow, "I absolutely don't know how I am! With all this professional jargon, and nothing but <WSD>'quick study</WSD>' and 'lines,' in one ear; and 'left upper' and 'right lower,' in the other, I am almost distracted!" 
Meaning of the word marked with <WSD> tags:  an actor who is able to learn their lines in a short amount of time