くろぼし 黒星 Common word LinksSentence search for 黒星Sentence search for くろぼしKanji details for 黒 and 星Edit in JMdict Noun1. black spot; black dot; bull's-eyeNoun2. mark indicating a defeatSumo, See also 負け星 まけぼしNoun3. loss; failure; mistake; faux pas Discussions Log in to talk about this word.