Final answer:
In line 118 of 'Song of Myself,' Whitman uses the sound device of repetition to emphasize the speaker's action and create a rhythmic quality.
Step-by-step explanation:
In line 118 from Sec. 52 of his poem "Song of Myself," Whitman uses the sound device of repetition. The line "I sound my barbaric yawp over the roofs of the world" repeats the word "sound" to create emphasis and reinforce the speaker's action of expressing themselves loudly and boldly. The repetition of the word also adds a rhythmic quality to the line.
Learn more about Whitman's use of sound devices in poetry