矢口否認

to deny flatly

arrow / dart / straight / to vow / to swear / old variant of 屎[shi3]

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

to negate / to deny / not

clogged / evil

to declare to be untrue / to deny

to recognize / to know / to admit