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with a chopping sound (of an axe); with a thump (when hammering a post into the ground)
「丁々」 has another reading with different meanings.
丁々と薪を割る音が響いた。
The sound of chopping wood echoed.
鍛冶屋で丁々と金を打った。
At the smithy, they hammered with thuds.
丁々と斧の音が森に響く。
The thud of axes echoes in the forest.