In “the seafarer” the phrase “summer’s sentinel,” meaning a cuckoo, is an example of a. a kenning. b. a predicate. c. a scop. d. an exile.

A kenning is defined as "a compound expression in Old English and Old Norse poetry with metaphorical meaning." In "The Seafarer" the phrase means something entirely different to what it's literal meaning is. Therefore, the phrase "summer's sentinel" is a kenning. 

A. a kenning.

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