(bound form) to seal; to close; to keep silent as in 缄口 jiān​kǒu or 缄默 jiān​mò; to seal a letter (often used on envelopes following the sender's name)

mouth of a person or animal; (bound form) oral

Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings

to speak; to talk; to state or tell