Here darkness and the shadow of death are spoken of as if they were people who could claim something as their own possession. The word "it" refers to the day of Job's birth. (See: [[rc://en/ta/man/jit/figs-personification]])
Here a cloud is spoken of as if it were a person who could live over the day of Job's birth. Alternate translation: "May a cloud cover it so no one can see it" (See: [[rc://en/ta/man/jit/figs-metaphor]])
This refers to things that block out the sun's light and create darkness. Here "black" represents darkness. (See: [[rc://en/ta/man/jit/figs-metaphor]])
"terrify that day." The day is spoken of as if it were a person who could be terrified by the darkness. (See: [[rc://en/ta/man/jit/figs-personification]])