late 14c., bleren "to wail," possibly from an unrecorded Old English *blæren, or from Middle Dutch bleren "to bleat, cry, bawl, shout." Either way probably echoic. Related: Blared; blaring. As a noun from 1809, from the verb.
The horns of the taxis blared
blandishment
blank
blank verse
blanket
blankly
blare
blaring
blarney
blase
blaspheme
blasphemous