1.mouth用作动词时主要指嘴唇活动但不出声,只是作出说或唱的动作,也可指“小声地说”“心不在焉地说”“言不由衷地说”。
2.mouth还可表示“(河水)流入”等。

mouth down(v.+adv.)
吃下 eat down
▲mouth sth ⇔ down
He mouthed down a square of cheese.他吃了一块方干酪。

mouth off(v.+adv.)
大发议论,自夸地说 speak strongly or as if one knew more than anyone else
▲mouth off
He was mouthing off about the high price of fish.他就鱼价的飞涨大发议论。

用作不及物动词
▲S+～(+A)
The new teacher is mouthing in order to show that he is very wise and great.这位新老师在装腔作势地讲话以表明他聪明而伟大。
Where does this creek mouth?这条小河流入哪里?
用作及物动词
▲S+～+n./pron.
The actor mouthed the words of the recorded song.演员不出声地唱着那首已经事先录好音的歌曲。
He was silently mouthing curses.他不出声地咒骂。
He was mouthing the usual platitudes about the need for more compassion.他言不由衷地说些需要更加同情之类的老一套话。

［同义词］ n.  aperture, entrance, opening
［词源］  ＜古英语muth (口,咀嚼)

1.mouth的基本意思是人或动物的“口”“嘴巴”,还可喻指“口状物”,如河口,山谷口,洞穴口,容器口,喷口,钳口,(乐器等)吹口,炮口等,且常由of引起的短语作后置定语修饰非生命物体之“口”, mouth引申还可表示“说话”,往往都带有贬义。
2.mouth还可表示“人”“讲话的人,代言人”。
3.mouth在口语中还可用以表示“怪相,鬼脸”。

all mouth
光说不干 say sth but do not have the courage to actually do
〔说明〕 all mouth只用作表语。
He is not all mouth, he gets results.他并非光是空谈,他是获得成效的。
His trouble is that he's all mouth and trousers.他的毛病是光说不做。

big mouth
嘴不严,多嘴 talk too much
I just mentioned Jim's girlfriend to his wife—me and my big mouth!我刚才同吉姆的妻子说到吉姆的女朋友——唉,怪我多嘴!

by word of mouth
口头通知 inform sb by mouth
I have informed him by word of mouth.我已口头通知他了。

give mouth
说出口 start to say sth
I have an opinion of you, sir, to which it is not easy to give mouth.先生,我对你有意见,不过很难说出口。

keep one's mouth shut
保持沉默,一声不吭 reveal a secret, especially of dishonest or criminal activity
He'd better keep his mouth shut or else.他最好保持沉默,否则。

Don't speak with your mouth full.嘴里塞满东西时不要讲话。
Open your mouth wider, please.请把嘴张大点儿。
We speak with our mouths.我们用口讲话。
A fall of rock blocked the mouth of the cave.一块石头落下来把洞口全堵住了。
His villa is situated at the mouth of a river.他的别墅位于河口。
I don't want any mouth from you!你别给我多嘴!
Every time I open my mouth he contradicts me.我一说话他就反对。
We must keep down the number of useless mouths.我们必须减少吃闲饭的人。
The news spread rapidly from mouth to mouth.消息很快就传开了。
He is the mouth of the House in its relations with the crown.他是议会对皇室的发言人。

1.他亲她的嘴。
［误］  He kissed her on mouth.
［误］  He kissed her on his mouth.
［正］  He kissed her on the mouth.
［析］  作“亲嘴”解时mouth前的the不可省略,通常也不用one's。
2.嘴里吃着食物,不要想着说话。
［误］  Don't try to talk with a mouth of food.
［正］  Don't try to talk with a mouthful of food.
［析］  mouth指“口,嘴”; 表示“一口,满口”,应该说mouthful。
3.她张着嘴,凝视着他。
［误］  She stared at him, the mouth open.
［误］  She stared at him, her mouth open.
［正］  She stared at him, mouth open.
三人向前行进,他们嘴里叼着烟斗,手里提着宝剑。
［误］  Three men came marching along, pipe in mouths and swords in hand.
［正］  Three men came marching along, pipe in mouth and sword in hand.
［析］  mouth用在这两种场合中,有很强的抽象的典型意义,不可数,不用于复数形式。前面不用物主代词或冠词。