Looks up and down (4)

I believe the answer is:

sees

I believe this clue is a double definition.

'looks' is the first definition.
(I know this)

'up and down' is the second definition.

(Other definitions for sees that I've seen before include "Watches" , "Understands" , "Bishoprics" , "Observes or perceives" , "Looks (both ways!)" .)

I've seen this clue in The Guardian and The Telegraph.

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