(At the witch’s house)
　　Witch: One egg, two eggs, three eggs. Oh, I’m so rich, ha, ha, ha ---------
　　(Jack and Prince ran into the house.)
　　Prince: You devil, I’m here to fight for justice. Give me my hen and harp back.
　　Witch: Very well, you want your stuff back? Then you have to knock me down first.
　　(Took out a box) Here, pick two scripts to determine your destiny.
　　Prince: (picked a script) Oh no, Jack, I don’t know how to gamble!
　　Jack: That’s OK. Let me help you. My mother always told me “Get me a chair!”
请问最后一句里“Get me a chair!”是成语吗？

应该是乐于助人的意思吧，是成语。