"utter suddenly or inadvertently" (usually with out (adv.)), 1570s, probably echoic. Related: blurted; blurting. As a noun, 1570s, probably from the verb.
He blurted out the secret
bluntly
bluntness
blur
blurb
blurry
blurt
blush
bluster
blustery
BMX
bo tree
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