刑事|けいじkeiji[1]atamadaka (head-high)

1. noun(police) detective
   その泥棒どろぼうは刑事けいじを見みると走はしって逃にげた。↗

   The thief ran away at the sight of a detective.
2. noun, prenominal modifiercriminal matter

• Related目明しめあかしWrittenEdo-period thief-taker who privately assisted officials in catching criminals; now found mainly in period dramas and historical novels.
• Related岡っ引きおかっぴきWrittenEdo-period hired thief-taker, a synonym of 「目明し」; appears mainly in period dramas.
• Related岡引きおかひきWrittenA rarer reading of 「岡っ引き」; refers to the Edo-period thief-taker, while modern detectives are 「刑事」.
• Antonym民事みんじNeutralCivil cases and affairs; the counterpart of 「刑事」 matters involving criminal law.

Use 「刑事」 for a police detective or a criminal case; 「デカ」 is the colloquial word for a detective, 「岡っ引き」 for an Edo-period thief-taker, and 「民事」 is the contrasting term for civil cases.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 刑法けいほうの適用てきように関かかわる事件じけんや事項じこう。
2. 私服しふくで犯罪はんざいの捜査そうさや犯人はんにんの逮捕たいほに従事じゅうじする警察官けいさつかん。