What's "straighten up" mean? When's it used?
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Native speaker’s answer
Rebecca
"Straighten up" is a phrasal verb that means to make something tidy and organized, to stand in an upright position, or improve one's behavior or responsibility. You can use it when you're talking about tidying, organizing, one's posture, or talking about your or someone else's behavior. It's also commonly used as an imperative when talking about posture or behavior. Ex: Straighten up your back when you're doing push-ups. => posture Ex: You need to straighten up so that your grades can get better. => behavior Ex: I straightened up my bedroom before the guests came over. => cleaning