Don, let's assume (3,2)
I believe the answer is:
put on
This might be a double definition.
'don let's' is the first definition.
'put on' can be an answer for 'don' (synonyms). I'm not certain of the 'let's' bit.
'assume' is the second definition.
(to put something on is to assume it)
Can you help me to learn more?
(Other definitions for put on that I've seen before include "Affixed" , "Increase as with weight" , "Donned" , "Apply (to a surface) - present (on stage)" , "Don; mount (a play)" .)