An American colloquial expression meaning top quality, first-rate, or the very best — equivalent to 'A1' or 'the real deal.' It adapts the Lloyd's of London ship classification system (where A1 indicated a vessel in the finest condition) into everyday speech. Used to praise a person, product, or experience. While the full 'A No. 1' form is now dated, it was common in 19th- and early 20th-century American English. The shortened 'A1' (or 'A-one') persists in casual use today.
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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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An American colloquial expression meaning first class, superior, or of the highest quality. Derives from the Lloyd's of London ship classification system, where A1 denoted a vessel in perfect condition. Entered American informal speech in the 19th century and was widely used through the mid-20th century. Now feels somewhat dated but remains recognizable as a superlative of quality. The phrase retains nostalgic charm and occasionally appears in ironic or retro contexts where speakers want to evoke a mid-century American voice.
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(US, colloquial) First class, superior.
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