- 血盆大口 xuèpéndàkǒu gaping bloody mouthA wide-open bloody mouth like a sacrificial bowl; describes the terrifying mouth of a beast of prey or, metaphorically, a greedy and rapacious person.
- 大口径 dàkǒujìng large caliberheavy caliber; large bore
- 说大口 shuōdàkǒu to talk bigto brag or boast; to talk big; (variant form)