مَتَى نَنْقُلْ إِلَى قَوْمٍ رَحَانَا يَكُونُوا فِي اللِّقَاءِ لَهَا طَحِينَا
Whenever we bring our mill against a people, in the encounter they become its flour.
Raḥānā means “our mill,” but it represents the war machine. Ṭaḥīnā is flour or ground grain: defeated adversaries are imagined as grain crushed by the mill.
Matā nanqul introduces a conditional pattern (“whenever we bring…”), and yakūnū supplies the consequence. The entire line is a hyperbolic martial metaphor, not a description of a literal mill.