Questão 3166913

Read the following dialogue.

Mark: Did you hear what happened to Tom?

Lisa: No, what’s going on?

Mark: Well, he tried to sabotage Sarah’s project to make her look bad, but the boss found out he was the one behind it. Now he’s the one in trouble.

Lisa: Wow, that’s crazy! I guess he got hoist with his own petard.

What is the meaning of the idiomatic expression “to be hoist with one's own petard”?