发誓的英文：
vow
pledge
swear
swear an oath
to take an oath

参考例句：

promised to reorganize the federal bureaucracy.
发誓整顿联邦官僚作风

To renounce or repudiate under oath.
放弃，发誓抛弃

He swore to revenge himself [to be revenged] on his enemy.
他发誓要向仇敌复仇。

I could have sworn you said "meow".
我敢发誓，你说“喵”了。

I could have sworn I heard voices saying, Is not he cute?
我真敢发誓我的确听到有人说，瞧它有多可爱！

After that quarrel, the girl swore that she would not let the young man set foot across her threshold.
争吵后，那姑娘发誓再也不让那个小伙子踏进她家门。

take one's dick
发誓

To promise solemnly;pledge.
发誓庄严地承诺;发誓

To renounce under oath;forswear.
发誓放弃;发誓革除

Pledge oneself to; devote oneself to
发誓;保证

vow是什么意思：
n. 誓言，誓约；发誓；许愿
v. 起誓，发誓；郑重宣告

But if you refrain from making a vow, you will not be guilty.
你若不许愿，倒无罪。

Vows made in storms are forgotten in calms
激动时发的誓言,平静时便忘却

I vowed that I love you.
我郑重宣告我爱你。

pledge是什么意思：
n. 抵押；典当品；许诺；誓言；信物
v. 保证，发誓；用…抵押

The property was pledged as security for loans.
这地产被当作贷款的抵押。

He pledged to fulfil his trust.
他保证履行责任。

You must not pledge your own health
切不可把健康作孤注一掷

swear是什么意思：
v. 诅咒；发誓
n. 诅咒；发誓

It's wrong to swear and shout.
骂人和喊叫是不对的。

If you swear you will catch no fish.
咒骂解决不了问题。

swear at; cuss out
咒骂