n. (Hira=くち) mouth, facial feature above the chin and below the nose; orifice, opening, aperture; number of times of putting food into the mouth identifier

n. (Trad=口, Pinyin=kou3) mouth, opening, Os, orifice

(Trad=口, Pinyin=kou3) measure word in Chinese

adj. (Trad=口, Pinyin=kou3) spoken

n. (Simp=口, Pinyin=kou3) mouth, opening, Os, orifice

(Simp=口, Pinyin=kou3) measure word in Chinese

adj. (Simp=口, Pinyin=kou3) spoken

[具] a tool; an implement

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[口] an opening; a mouth; a window; a hole; a wicket

kou3 shi4 xin1 fei1
The mouth says "yes", but the heart says "no".
To be double-faced.

kou3 mi4 fu4 jian4
Honey in mouth but dagger in heart.
Said about treachery and craftiness. Sweet words from the mouth, but murder in mind. Hypocritical and malignant.

zhang1 kou3 jie2 she2
The mouth is open but there's a knot on the tongue.
Being unable to speak.

hu3 kou3 yu2 sheng1
To be saved from the tiger's mouth.
A narrow escape from death.