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double-O

[ duhb-uhl-oh ]
/ ˌdʌb əlˈoʊ /
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noun, plural dou·ble-Os.Older Slang.
careful scrutiny or close inspection.
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Origin of double-O

1915–20; after the two o's in once-over
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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