The couplet means that the heat and bloodshed of the battlefield should be allowed to happen; first, we ourselves shall sit beneath the sword.

This couplet is a magnificent declaration of valor and unwavering courage. It speaks of a readiness to face the ultimate sacrifice—the battlefield—without fear. Mir Taqi Mir is stating that if conflict arises, he is not afraid of the bloodshed; rather, he is prepared to willingly embrace the sword and face death head-on. It’s a powerful testament to defiance and self-sacrifice in the face of overwhelming odds.