Making a loud, ringing sound like metal hitting metal.
From Middle English 'clang,' likely imitative in origin, meant to describe the sound itself. The '-ing' suffix makes it a present participle showing the action happening.
The word 'clang' is onomatopoeia—it's literally the sound it describes—which is why your brain hears the metal-on-metal ring just from saying the word! Medieval blacksmiths' workshops would have been constant 'clanging' from dawn to dusk.
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