also: おおくち
noun
big mouth; wide-open mouth
Refers to a physically large mouth or a mouth opened wide. Often used in set phrases like 大口を開ける.
ライオンが大口を開けてあくびをした。
The lion yawned with its mouth wide open.
Refers to boastful or exaggerated speech. Common in phrases like 大口を叩く (to talk big).
彼はいつも大口を叩くけど、実際は何もできない。
He always talks big, but in reality he can't do anything.
noun, noun which may take the genitive case particle 'no'
large amount; large quantity; bulk
Used for large orders, transactions, or quantities, especially in business contexts. Antonym: 小口 (small lot).
Antonyms: 小口 (こぐち)
大口の注文が入った。
We received a large order.
大口取引には割引があります。
There is a discount for bulk transactions.