A colorful piece of American dialectal slang for an exceptionally heavy downpour of rain — the kind that comes down in sheets and floods roads in minutes. 'Cob-floater' is vivid rural hyperbole: a rain so fierce it could float a corncob right off the field. You might hear it from older speakers in the Midwest or South when describing a proper gullywasher of a storm.
We had to pull over on the highway because that cob-floater came out of nowhere and we couldn't see two feet in front of us.
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(US, dialectal) A very heavy downpour of rain.
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