In short, do the same (5)
I believe the answer is:
ditto
This could be a double definition.
'in short do' is the first definition.
'ditto' can be an answer for 'do' (I've seen this before). I'm not certain of the 'in short' bit.
'the same' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for ditto that I've seen before include "As given above" , "Same again, indicated by two dots" , "As per previous" , "Copy" , "Two dots say same again" .)