student asking question

why is "in" used at the end of the sentence?

teacher

Native speaker’s answer

Rebecca

"In" is used at the end, as it forms part of the phrase "blow [something] in," which comes from the phrase "do [something] in." To "do [something] in" means to defeat or destroy it. It also indicates the movement of the destruction of the house into itself. Ex: They're gonna do the building in this week. = They're gonna demolish the building this week. Ex: My university work is going to do me in. Especially this semester.

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