Send — up or down (5)
I believe the answer is:
refer
I believe this is a double definition.
'send' is the first definition.
(referring is a kind of sending)
'up or down' is the second definition.
(Other definitions for refer that I've seen before include "Advert, mention" , "Pertain or cite" , "Send or direct to a specialist" , "Direct elsewhere" , "Make allusion, or turn to for information" .)