冷不防的英文：
all of a sudden
all of sudden
of a sudden
off balance
out of a clear sky

参考例句：

They caught him off guard.
他们给他来了一个冷不防。

Snatch a kiss
冷不防接一个吻

Make a sudden vicious swipe at sb
冷不防地照着某人猛击.

We took the enemy at vantage
我们冷不防地袭击了敌人。

They popped a question at me.
他们冷不防向我提了一个问题。

Our soldiers took the enemy at vantage.
我们的战士冷不防地袭击了敌人。

Catch sb with his pants/trousers down ;catch or trap sb when he is unprepared or not being watchful
乘某人措手不及;乘其不备;出其不意;冷不防.

The police took the burglar by surprise as he opened the window.
正当窃贼把窗打开时，警察冷不防逮住了他。

The policeman took the burglar by surprise as he opened the window.
当窃贼开窗子的时候，警察冷不防地捉住了他。

Catch sB. unawares (= take sB. unawares)
冷不防地捉住某人，出其不意地袭击某人

all是什么意思：
adj. 一切的，所有的；整个的；各种的
pron. 一切；全部；大家，全体
n. 全部财产；所有一切
adv. 完全地；极其

The policy of burn all,kill all,loot all
三光政策

It is all on the house.
费用全由敝店支付。

(all) in a twitter
(极度) 紧张[兴奋],激动

sudden是什么意思：
adj. 突然的，意外的；快速的
n. 突然发生的事

A sudden loud blow or bump.
砰然作响发出砰一声的猛击或猛撞

A sudden, striking surprise;a twist.
意外发展突然的、惊人的变化；意想不到的转折

Hasty climbers have sudden falls
大起者有大落