change for the better
The lazy student promised to reform; the habitual cheater finally saw the light
settle or put right
we need to iron out our disagreements
put (things or places) in order
Tidy up your room!
make free from confusion or ambiguity; make clear
Could you clarify these remarks?; Clear up the question of who is at fault
extricate from entanglement
Can you disentangle the cord?