おおぐち 大口 Common word Show 1 collocation 大口をたたく - to brag LinksSentence search for 大口Sentence search for おおぐちSentence search for おおくちKanji details for 大 and 口Edit in JMdict Noun1. big mouth; mouth opened wideNoun2. boastful speech; tall talk; bragging; boastingNoun, Noun which may take the genitive case particle 'no'3. large amount; large quantityAntonym: 小口 こぐちOther forms大口 【おおくち】 Discussions Log in to talk about this word.