It seems like the author is using kenning, because instead of saying "teacher", they're using "grade-giver".
so the poetic devise is kenning
hope this helps :)
Summary Sally is ten minutes late but looks terrific in her black coat and ... The dominating theme of Chapter 17 is compatibility, or lack of it, between couples. The opening scene, the play, and the exchange at the skating rink all deal with the ... various trials of life, and Holden concedes that it is not the worst he has seen.
