hammer, mallet
鎚 centers on a heavy striking tool: a hammer or mallet used for pounding or driving objects.
鎚 combines 金 (metal) with 追, which likely contributes the sound and may relate to the idea of striking or driving forward. The character is associated with metal hammers or mallets.
The left side is metal 金, and the right side 追 suggests chasing or driving. Picture a metal hammer chasing a nail, driving it into wood with each strike.
For ツイ, imagine a hammer making a sharp 'tsui' sound as it hits metal: the onomatopoeic 'tsui' cues ツイ while the metal hammer strikes.