To spread out or open something that is folded or rolled up, such as a flag, sail, or piece of fabric. The sailors began to unfurl the sails as the wind picked up.
To become spread out or open from a folded or rolled state. The flower petals began to unfurl in the morning sunlight.
To unfold or develop gradually, especially in a figurative sense, as a story, idea, or event. As the evening progressed, the full extent of the mystery unfurled before the audience.