- Double-check is a colloquial expression and can be classified as non-grammatical verb. I am unable to find any other explanation for this. Compare with expression like double-edged , bouble- quick etc, where the word double acts as adjectives, An interesting colloquialism is , double-talk, where it acts a both an adjective and adverb. In the expression, double-check, the word double qualifies the word check and, so, could be called an adverb. There are many such expressions in English language when it is used formally . Formal expressions do not follow the rules of traditional grammar .
Check is a verb, double would be a modifier.
Yes, if spelt "double-check"
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