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with a chopping sound (of an axe); with a thump (when hammering a post into the ground)
「丁丁」 has another reading with different meanings.
丁丁と木を叩く音がする。
There's a thudding sound of hitting wood.
丁丁たる槌音が聞こえた。
I heard the thud of hammering.
職人が丁丁と鍛えている。
The craftsman hammers with thuds.