double-O [duhb-uh l-oh] Word Origin noun, plural dou·ble-Os. Older Slang.
- careful scrutiny or close inspection.
Origin of double-O 1915–20; after the two o’s in once-over
double-O [duhb-uh l-oh] Word Origin noun, plural dou·ble-Os. Older Slang.
Origin of double-O 1915–20; after the two o’s in once-over