をだまして

deceive …

→ を
phrase Common #7,741
deceive … The particle を marks the person or thing being deceived. The verb form だまして often connects to what happens next, such as deceiving someone and taking their money.
JA: 彼は私をだまして秘密を聞き出した。
EN: He deceived me and found out the secret.

彼をだましてはいけない。

Don't deceive him.

あの男はあきらかに我々をだましている。

That man is obviously trying to deceive us.

我々をだましていたとか?

Were you deceiving us?

— 鶴は翔んでゆく (1957)

彼女は私をだまして金を取った。

She tricked me and took my money.

その男はまんまと私をだまして承知させた。

That man tricked me into agreeing.

参ったよ、彼は私をだましていたんだ。

I’m stumped—he had been deceiving me.

彼はすっかり私たちをだましていた。

He had completely fooled us.

人をだましてはいけないけど、自分をだましてはもっといけないのです。

You mustn’t deceive others, but deceiving yourself is even worse.