Come down or up maybe (4)
I believe the answer is:
pour
'come down' is the definition.
The definition and answer can be both to do with motion as well as being verbs in their base form.
Maybe you can see a link between them that I don't see?
'or up maybe' is the wordplay.
'maybe' indicates anagramming the letters.
'or'+'up'='orup'
'orup' anagrammed gives 'POUR'.
Can you help me to learn more?
(Other definitions for pour that I've seen before include "(Of rain) fall heavily" , "Cause to flow as from pot to cup" , "16 [CATS AND DOGS]" , "Give out liquid" , "Teem" .)