砸夯

砸夯	zá hāng	to pound the earth to make a building foundation
砸	zá	to smash / to pound / to fail / to muck up / to bungle
夯	bèn	variant of 笨
夯	hāng	to ram; to tamp / a rammer; a tamper / variant of ㄏㄤ[hang1]