Search; scrub (5)
I believe the answer is:
scour
I believe this is a double definition.
'search' is the first definition.
(I know that scour is a kind of search)
'scrub' is the second definition.
(I know that scrub can be written as scour)
(Other definitions for scour that I've seen before include "Clean abrasively" , "Comb" , "flush out" , "Clear out" , "Scrub hard" .)