Final answer:
The term 'spent' in poetry typically conveys a sense of being used up or exhausted, either physically or emotionally, based on the poem's context.
Step-by-step explanation:
The word spent as it is used in line 15 of the poem “Sybil Ludington’s Ride” likely means that something has been used up or exhausted. In poetry, words can be used metaphorically or have nuanced meanings, and the context presented within the poem is essential for interpreting the word's specific usage. It might refer to a character being physically or emotionally exhausted after the ride, or perhaps resources being used up. Without the specific line from the actual poem, a precise interpretation isn't possible. However, it is a common term in literary contexts to describe a sense of depletion.