ichidan verb, transitive verb
harden by beating; compact by pounding
Used for physically striking something repeatedly to make it firm or solid, such as earth, snow, or metal.
地面を打ち固めてからコンクリートを流す。
They harden the ground by beating it before pouring concrete.
雪を打ち固めてかまくらを作った。
We compacted the snow by pounding it to make a snow hut.