Plural of thud; heavy, dull sounds or the act of making such sounds.
From Middle English 'thud,' likely imitative in origin, first recorded in the late 1600s. The word perfectly mimics the heavy, muffled sound itself.
Onomatopoeia strikes again! 'Thud' hits your ear the same way an object hits the ground—dull and heavy. Comic books made this sound even more iconic by writing 'THUD!' in big letters whenever something heavy fell.
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