From the given options, select the Figure of Speech (Poetic Device) used in the expression:

"Matthew met Michael at the mayor's moor” 

The correct answer is Alliteration.

Key Points

• The figure of speech used in the expression "Matthew met Michael at the mayor's moor" is alliteration.
• Alliteration is a poetic device where the same sound or letter is repeated at the beginning of adjacent or closely connected words.
• In this case, the "m" sound is repeated in "Matthew," "met," "Michael," "mayor's," and "moor."
• Alliteration is often used in poetry and prose to create a musical or rhythmic effect, to emphasize certain words or phrases, or to create a sense of unity or cohesion in a text.
• Thus, option 4 is the correct answer.