mouth作名词的时候意思是：“口，嘴；河口”，作及物动词的时候意思是：“做作地说，装腔作势地说；喃喃地说出”，作不及物动词的时候意思是：“装腔作势说话”。

例句

用作名词 (n.)

Her mouth is her best feature.
她的嘴是她容貌上最好看的部分。

The dying animal was found foaming at the mouth.
那只将死的动物被发现口吐白沫。

Seeing that we are confused about her attitude， she had to give mouth to her doubts.
看到我们对她的态度表示不解，她只得说出心里的疑惑。

The sand has silted up the mouth of the river.
泥沙已把河口堵住了。

用作动词 (v.)

The nurse mouthed the word "quiet".
护士以口形默示“安静”。

I dislike lecturers who mouth their speeches.
我不喜欢夸夸其谈的演讲者。

He crept into the corner， mouthing curses.
他悄悄地移到角落，嘴里喃喃地诅咒着。

词汇搭配

用作名词 (n.)

动词+～

button up one's mouth 保持沉默

close one's mouth 闭嘴

fill one's mouth full 填满嘴，堵住嘴

give mouth to 说出，讲出，透露

have ten mouths to feed 要养十口人

shoot off one's mouth 信口开河，夸夸其谈

shut one's mouth 闭嘴

stop sb's mouth 不让某人说话，用贿赂堵住某人的口

take the bread out of one's mouth 夺某人的饭碗

wipe one's mouth 擦嘴

形容词+～

beautiful mouth 好看的嘴

big mouth 碎嘴子，说话冒失的人

hungry mouths 饥饿的人们

pretty mouth 好看的嘴

small mouth 小口

sweet mouth 甜蜜的嘴

useless mouth 只吃不做的人

名词+～

river mouth 河口

介词+～

express by the mouth 口头表达

by way of mouth 从口(入)

by word of mouth 口头的

out of sb's mouth 出自某人之口

vessel with a small mouth 口很小的容器

with one mouth 异口同声地

look down in the mouth 显得很沮丧

words in everybody's mouth 众人的说法

in the mouth of 据说

with full mouth 大声地

with open mouth 大声地

～+介词

mouth of the river 河口

mouth with thick lips 长着两片厚嘴唇的嘴

用作动词 (v.)

～+副词

mouth silently 嘴动而不出声地说

mouth down 吃下

mouth off 大发议论，自夸地说