Obtain or understand (3)
I believe the answer is:
get
I believe this is a double definition.
'obtain' is the first definition.
(I know that obtain can be written as get)
'understand' is the second definition.
(I know that understand can be written as get)
(Other definitions for get that I've seen before include "Procure or secure" , "Acquire" , "See 18" , "Escape" , "Fetch or obtain" .)