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Difference between Come by something and Go by something

come by something

1. obtain smth. (that is hard to get):

  • Jobs were not so easy to come by when I was a boy.

2. happen to get smth. by accident:

  • How did you come by that scratch on your cheek?

go by something

1. act according to smth.:

  • If we go by instructions, we must leave now.

2. base one’s judgment on smth.:

  • You make a mistake if you go by appearances.