ichidan verb, transitive verb
nail down; fasten by hammering
Used for physically attaching something by driving nails or similar fasteners. Often with ～に釘で or ～を板に.
板を壁に打ち付ける。
Nail a board to the wall.
看板を柱に打ち付けた。
I nailed the sign to the post.
ichidan verb, transitive verb
Describes striking a body part or object against something, often accidentally or forcefully. Common with 頭, ひざ, etc.
転んでひざを床に打ち付けた。
I fell and banged my knee on the floor.
頭を天井に打ち付けないように気をつけて。
Be careful not to hit your head on the ceiling.
ichidan verb, transitive verb
throw against; fling at
Used when throwing something forcefully against a surface, such as a wall or floor. Often implies anger or violence.
怒ってコップを壁に打ち付けた。
He got angry and threw the cup against the wall.
彼は本を床に打ち付けた。
He flung the book onto the floor.