To strike or hit; to bump or collide with something; to afflict or trouble.
From Old Norse 'klára' or related Scandinavian roots. The word entered Northern English and Scottish dialect through Viking-age contact. It may also relate to onomatopoeia suggesting impact sounds.
Clour is a dialectal word that never quite made it into standard English, but it's been steadily recorded in Scottish and Northern English texts since medieval times—it's a perfect example of how some words simply fail to diffuse nationally, remaining trapped in regional speech communities like linguistic islands.
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