Figurative language is language beyond the dry and literal words we might find in a tax summary or a scientific report that only recorded facts. Figurative language, in contrast, adds a layer of color and enhances the meaning of a written work. Shakespeare does use figurative language in Sonnet 138.
For example, Shakespeare uses alliteration, which is when words that begin with the same consonant are placed in close proximity. This adds a pleasing sense of rhythm to a poem, as well as placing added emphasis on the alliterative words. An example would be in lines 12 and 13 in the repeated "L" sounds:
love loves not to have years told.
Therefore I lie with her ...
Alliteration also appears in the last line in the repeated "F" sounds in "faults" and "flattered."
Other figurative language would be the end rhymes, typical of a traditional sonnet, which add a sense of rhythm and regularity to the verse, such as in "truth" and "youth" and "young" and "tongue."
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