Final answer:
In the poem "Ulysses," the lines that reflect Ulysses' desire to keep pressing on into the twilight of life are known as enjambment.
Step-by-step explanation:
In the poem "Ulysses," the lines that contain both the end of one sentence or phrase and the beginning of a new one are known as enjambment. These lines reflect Ulysses' desire to keep pressing on into the twilight of life. Enjambment is a stylistic device where the lines flow smoothly into each other without punctuation, creating a sense of continuous movement.