Crossword Genius

Reads swiftly through the column and criticises it (4,4)

Ross

I believe the answer is:

runs down

I'm a little stuck... Click here to teach me more about this clue!

'reads' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for runs down that I've seen before include "Speaks ill of" , "Criticises" , "finds" , "searches successfully" , "what NI county boss does?" .)

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