Speak freely and admit all (4,2)
I believe the answer is:
open up
This might be a double definition.
'speak freely' is the first definition.
(I've seen this before)
'admit all' is the second definition.
'open up' can be an answer for 'admit' (thesaurus). I am unsure of the 'all' bit.
'and' is the link.
Can you help me to learn more?
(Other definitions for open up that I've seen before include "Unlock building or reveal inner thoughts" , "Speak freely and without restraint" , "speak his heart" , "Become more communicative" , "Begin firing; disclose" .)