American English for a pressure washer — a high-pressure water cleaning device used to remove dirt, grime, mould, and paint from surfaces. The term is widely used in the US and is essentially interchangeable with 'pressure washer', though 'powerwasher' may emphasise the power aspect slightly more.
He rented a powerwasher to clean the driveway before the party and was genuinely thrilled by the results.
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(US) A pressure washer.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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