捶 puts 扌 hand with 垂 chuí, which supplies the sound. The hand part points to hitting, so it first meant 'to beat someone with a stick'. That grew to 'to thump, beat'.
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Example Sentences
他在捶打铁块。
tāzàichuídǎtiěkuài 。
He is hammering a piece of iron.
她用手捶背,感觉好多了。
tāyòngshǒuchuíbèi , gǎnjuéhǎoduōle 。
She is hammering her back with her hands and feels much better.