1. cause to take on a definite and clear shape

e.g. He tried to crystallize his thoughts

Synonym: crystallizecrystalisecrystalize

2. cause to form crystals or assume crystalline form

e.g. crystallize minerals

Synonym: crystallizecrystalizecrystalise

3. make free from confusion or ambiguity
make clear

e.g. Could you clarify these remarks?
Clear up the question of who is at fault

Synonym: clearclear upshed light oncrystallizecrystalizecrystalisestraighten outsort outenlightenilluminateelucidate