student asking question

What does he mean by "line in the sand"?

teacher

Native speaker’s answer

Rebecca

By "line in the sand", he means the "limit" to what one will do. A point he won't go beyond. Jake's okay with "flipping off" his teacher, but he's not okay with lying. He won't lie- this is his line in the sand. Ex: It's okay if your room is a bit messy, but my line in the sand is leaving dirty dishes in the sink. Please wash them! Ex: This is my line in the sand. I will not run a marathon.

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