What's the meaning of go bump?
I read a sentence which is "Something went bump". Does that mean something knocked on the door?

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"To go bump" means "to make a noise" (such as *bump*).

We have a phrase, "things that go bump in the night", which we use when we talk about mysterious noises at night, or even ghosts.

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It could also be a metaphor. The speaker might have suddenly remembered something or realised what was happening.

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It means something maybe fell or was knocked over and made a noise. Depends what the context might be.

Hope this helps