Question

figure of speech of "O grave where is the victory"

Answer 1

"O grave where is the victory"
Figure of speech - Apostrophe (form of Personification )

Answer 2

Personification is the figure of speech used in the given sentence.

Personification

• Personification is a hyperbole wherein a thought or thing is given human credits and sentiments or discussed as though it were human. Representation is a typical similitude in that human qualities are credited to nonhuman things. This permits essayists to make life and movement inside lifeless things, creatures, and, surprisingly, unique thoughts by appointing them conspicuous human ways of behaving and feeling.
• Personification is a scholarly gadget tracked down frequently in youngsters' writing. This is a powerful utilization of non-literal language since exemplification depends on a creative mind for understanding. Obviously, perusers know at a sensible level that nonhuman things can't feel, act, or think like people. In any case, representing nonhuman things can be a fascinating, imaginative, and viable way for an essayist to delineate an idea or come to a meaningful conclusion.
• For example, in  "O grave where is the victory", the poet talks to the grave as if it was a person. Thus, the device of speech used here is personification.

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