Raining cats and dogs

From Teflpedia

(It's) raining cats and dogs is an English idiom expressing a weather condition - heavy rain.

Unfortunately it's one of these that students often learn and remember, even though it's not commonly employed by English speakers, who tend to say things like "It's chucking/throwing it down!". When it is used by English speakers, it's usually as a joke, which is a nuance that students may completely miss. There are plenty better examples of English idioms [1]

Ideally this would be backed up by corpus-based linguistics.

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