おおくちこきゃく 大口顧客 LinksSentence search for 大口顧客Sentence search for おおくちこきゃくSentence search for おおぐちこきゃくKanji details for 大, 口, 顧 and 客Edit in JMdict Noun1. major customer; large customerOther forms大口顧客 【おおぐちこきゃく】 Discussions Log in to talk about this word.