Bring up what you can bring up (4)
I believe the answer is:
rear
I believe this is a quintuple definition!!
'bring' is the first definition.
(thesaurus)
'up' is the second definition.
(thesaurus)
'what' acts as a link.
'you can' is the third definition.
'rear' can be an answer for 'can' (synonyms). I am not sure about the 'you' bit.
'bring' is the fourth definition.
(thesaurus)
'up' is the fifth definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for rear that I've seen before include "Raise; behind" , "Hind part" , "Rump" , "Back; bring up (young)" , "early, long before now" .)