Is "safe with [someone/something]" a common expression?
Yes, it is! To be "safe with" something or someone means to be protected, not at risk of being exposed or in danger. Ex: Don't be scared about walking through the forest! You'll be safe with me. Ex: I'll be safe upstairs when the guests come over. I don't feel like talking to anyone. Ex: Your necklace will be safe with Jen until you want it back.
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