to flee: to break away and run, usually a deliberate escape from danger or from someone with power over you
At its heart this word is the deliberate bolt for safety. It is what a person does when staying put has become too dangerous: a runaway servant, a fugitive prince, a hunted king all do this. The picture is escape, breaking loose and getting clear, and it is planned rather than panicked. Where a related word names the blind scatter of a routed army, this word names the chosen flight of someone who has decided to get out and knows where he is heading.
The same word stretches naturally in two directions. When the runner is not a person but a thing that slips quickly away, it means to vanish or pass swiftly: days that race by, a shadow that will not stay. And when someone forces the running, it means to drive off or chase away: to put an enemy to flight, or to hound a person out.
These all share one motion seen from different angles. Someone breaks away and runs; something rushes past too fast to hold; or one person makes another run. The deliberate, directed escape is the constant, which is why the word carries such weight when the one fled from is God: to run from God is a chosen rebellion, not an accident.