#1 crystallise v. [clear, clear up, shed light on, crystallize, crystalize, crystalise, straighten out, sort out, enlighten, illuminate, elucidate] make free from confusion or ambiguity; make clear; "Could you clarify these remarks?"; "Clear up the question of who is at fault". wn
#2 crystallise v. [crystallize, crystalize, crystalise] cause to form crystals or assume crystalline form; "crystallize minerals". wn
#3 crystallise v. [crystallize, crystalise, crystalize] cause to take on a definite and clear shape; "He tried to crystallize his thoughts". wn
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