上當(dāng) be taken in; be fooled; be duped; be tricked; bite at a bait; play into someone's hands 不要上壞人的當(dāng)。 don't let yourself be fooled by evil people. 上當(dāng)只有一回。 a fox is not taken twice in the same snare. 你們可上當(dāng)了。 you have fallen into the trap. 他用假計(jì)劃使她上當(dāng)。 he used the fake plans to trick her