to refuse to speak or never mention something again; typically used before 不 bù in the phrase 绝口不提 jué​kǒu​bù​tí

to be unceasing or non-stop in speech; used after 不 bù in patterns such as 赞不绝口 zàn​bù​jué​kǒu or 骂不绝口 mà​bù​jué​kǒu

(archaic) to have the words barely out of one's mouth