[shàng dàng]
be taken in; be fooled; be duped; be tricked; bite at a bait; play into someone's hands
Don't let yourself be fooled by evil people.
不要上坏人的当。
A fox is not taken twice in the same snare.
上当只有一回。
You have fallen into the trap.
你们可上当了。
He used the fake plans to trick her.
他用假计划使她上当。