I'll lend you my phone.
✗ I'll borrow you my phone.
Can I borrow your phone?
✗ Can I lend your phone?
"Lend" means to let someone use an item that should be given back.
If you want, I can lend you my coat.
I'm giving you the opportunity to borrow my coat.
"Borrow" means to take an item from someone that should be given back.
Feel free to borrow my coat.
I'm offering to lend you my coat.
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