ʿAbrah denotes a tear. Muhrāqah describes it as shed or poured out. Both words are feminine, indefinite, and nominative, showing agreement between noun and adjective.
In inna shifāʾī ʿabratun muhrāqatun, inna adds emphasis; shifāʾī is its subject and ʿabrah its predicate. The poet makes a firm personal claim: tears bring relief from his suffering.
Adding muhrāqah to “tear” makes the emotion active and visible. This is not an unshed feeling but an actual act of weeping.