Moving — thus, one is very active (2,3,2)
I believe the answer is:
on the go
This could be a double definition.
'moving thus' is the first definition.
'on the go' can be an answer for 'moving' (I've seen this before). I am not sure about the 'thus' bit.
'one is very active' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for on the go that I've seen before include "ready to start monopoly?" , "Very busy, in constant motion" , "Active, in constant motion" , "Keeping busy, not stopping" , "Ever busy" .)