المَتْرَبَة — الأَتْرَاب
Poverty — people of the same age or standing.
The two words share prominent t-r-b sounds, yet they mean different things. One names the condition of destitution; the other names those from whom the narrator has been separated.
The sound resemblance makes the line memorable. It does not merge the meanings: the clause gives a cause (poverty) and an effect (separation) in a compact, balanced expression.