What does "mouth off" mean?

To speak disrespectfully To talk rudely or boastfully.

How do you use "mouth off" in a sentence?

He was mouthing off to the teacher. Don't mouth off to me! She mouthed off about her boss.

Phrasal Verb BritishAmericanAustralian ★★★☆☆ Moderate informal

Meaning: To speak disrespectfully

顶嘴，说大话

Contestar mal, soltar bravuconadas

生意気を言う、悪口を言う

건방지게 말하다, 함부로 지껄이다

To talk rudely or boastfully.

粗鲁地说话或自吹自擂。

Hablar de manera irrespetuosa o presumida.

失礼に話したり、自慢げに話したりすること。

무례하거나 허풍을 떨며 말하는 것.

Base verb: mouth

Particle: off

Separable: No — the verb and particle stay together

He was mouthing off to the teacher.
他对老师顶嘴
Le contestaba mal al profesor
彼は先生に生意気な口をきいていた
그는 선생님에게 건방지게 말하고 있었다.
Don't mouth off to me!
别跟我顶嘴！
¡No me contestes así!
私に生意気な口をきくな！
나한테 함부로 지껄이지 마!
She mouthed off about her boss.
她说老板坏话
Soltaba bravuconadas sobre su jefe
彼女は上司の悪口を言っていた
그녀는 상사에 대해 험담을 했다.

Context: rude, disrespectful, boastful

Tone: confrontational

From using one's mouth aggressively.

Era: Modern

Generation: Younger

Social background: Universal