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[pass someone by] if something passes you by, you do not notice it
Did you tell me about that? Sorry, it completely passed me by.

[pass by someone/something] to go past
Three buses passed by, but none of them was the right one.
I was just passing by her house, so I thought I’d call in and see her.
A car slowly passed by the front of the house.

[pass someone by] if something passes you by, you are not able to take advantage of the opportunities it offers
Sometimes I feel that life is just passing me by.