上当的英文：
be taken in
be fooled
be duped

参考例句：

It is the careless man that will suffer;never will the prudent man fall into a trap.
只有大意吃亏，没有小心上当。

If I don't watch you, you trap me every time.
每回我一不留神，你就总叫我上当。

Shipped out on a tanker.
在油轮上当船员

He ushered at the banquet.
他在宴会上当引座员。

To deceive(an unwary person.
欺骗(易上当的人)

"If a man deceives me once, shame on him, if he deceives me twice, shame on me"
上当一回头,再多就可耻

He is only prime minister in name.
他只是名义上当首相。

This neighbor crewed on a ferryboat.
这位邻居在一艘渡船上当船员。

The hunter put the lion's head on the wall as a trophy.
猎人把狮子的头挂在墙上当纪念品。

She vetted for the farms in the area for many years.
她在这里的农场上当兽医当了很多年。

taken是什么意思：
v. take的过去分词；拿，取

An amount of game taken or legally permitted to be taken.
取得的猎物或被法律允许的狩猎数量。

The bull must be taken by the horns.
捉牛须执角。

The Bull must be taken by the horns
捉牛须先捉牛角;勇于面对困难

fooled是什么意思：
n. 愚人，傻瓜；受骗者
v. 愚弄，欺骗；戏弄；开玩笑；浪费，虚度
adj. 愚蠢的；傻的

There is no medicine to cure a fool || There is no medicine for curing a fool
笨人无药可医

She will rather fool with a bee than being with a fool.
她情愿玩玩蜜蜂也不愿与愚人为伍。

He is a positive fool.
他是一个十足的傻瓜。

duped是什么意思：
[ dupability ]的过去式;[ dupable ]的过去式;[ dupe ]的过去式;[ duper ]的过去式

He was duped into signing.
他受骗签订合同。

One who is easily swindled;a dupe.
傻瓜容易上当受骗的人；易被愚弄的人

In any case, I am not his dupe.
总而言之，我还没有上他的当。