Are passed on to, but are not kept up (4,4)

I believe the answer is:

come down

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'up' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see a link between them that I can't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for come down that I've seen before include "disappointment" , "Decline" , "reach a decision" .)

I've seen this clue in the Evening Standard.

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