expression, godan verb (-ku)
penetrate the wall
Literal expression meaning to physically pierce or go through a wall. Can also be used figuratively for overcoming a barrier.
その矢は壁を貫いた。
The arrow penetrated the wall.
彼の声は壁を貫くように響いた。
His voice resounded as if penetrating the wall.
The verb 貫く alone means 'to pierce' or 'to go through'; 壁を貫く is a specific phrase using it with 壁.
Phrase composed of 壁 (wall) + を (object marker) + 貫く (to pierce, penetrate). The verb 貫く is of native Japanese origin.