This is the 2460th most frequent Arabic word.
مالك
Owner; possessor.
The word 'مالك' here means 'owner', referring to someone who owns the school.
مالك المدرسة يزور الصفوف.
The owner of the school is visiting the classrooms.
The word 'مالك' in this context is a colloquial expression meaning 'why are you' or 'what's wrong with you'.
مالك منزعجًا اليوم؟
What's wrong with you today?
The related word 'ملكك' is derived from 'مالك' and means 'yours', connecting to possession.