expression, godan verb (-ku)
pierce through; run through
Rare term for piercing something completely with a lance, arrow, or similar weapon. Mostly found in historical or literary contexts.
古文書には、敵を裏かく場面が描かれている。
In the old document, a scene of running an enemy through is depicted.
Common verb for piercing or penetrating; 裏かく is a rare synonym with a more specific image of piercing all the way through with a weapon.
The derivation is uncertain. The kanji 裏 (back, reverse) combined with かく (possibly related to 掻く or 書く) may suggest piercing through to the other side, but this is speculative.