Third-person singular of 'blam' (to make a loud explosive sound); plural of 'blam' (the sound itself).
Onomatopoeia from the mid-20th century, imitating the sound of a gunshot or explosion. The word mimics its own meaning, typical of comic book and action movie language.
Comic books gave us 'blam' as a way to make readers *hear* action on silent pages—it's one of thousands of onomatopoeia that prove English speakers are constantly inventing new words to match the sounds around them.
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