Final answer:
Alliteration is the repetition of beginning sounds in a line of verse.
Step-by-step explanation:
Alliteration is the sound device that involves the repetition of beginning sounds in a line of verse. It is characterized by the repetition of consonant sounds at the beginning of words or stressed syllables. An example of alliteration can be found in Ezra Pound's poem "The Seafarer," where the repeated beginning sounds create a musical effect.
Learn more about Sound devices in poetry