An onomatopoeia for a loud metallic or hollow impact. Often paired with 的一声 ('with one sound') to describe a sudden bang, like a slamming door or a dropped pot.
Mouth radical on the left marks this as a sound made or imitated by the mouth — the standard signal for onomatopoeia and exclamations. Same family as 叮 ding, 咚 thud, 哗 splash.
Right side 光 supplies the sound — the reading guāng carries straight over with no drift. It contributes no meaning here; the whole character is built purely to spell out a noise.
