The definition that would best define cob in the passage is B. a crudely struck old Spanish coin of irregular shape
This refers to the meaning of a word based on its usage in a sentence which can either be denotative or connotative.
Hence, we can see that from the complete text, there is the narration of the movements of the narrator as he "reined in my impatient cob" which was shown to mean a crudely struck old Spanish coin of irregular shape
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