to flee: to move fast away from something dangerous, whether to save yourself, to get clear of it, or to keep well away from it
This is the ordinary Greek word for running away, and it was doing the same job for centuries before the New Testament used it. Most of its appearances are plain storytelling: pig herders bolt when a man is freed of demons, the disciples scatter when Jesus is arrested, a family slips away to Egypt at night, and Jesus tells people in Judea to head for the hills when disaster comes.
The same motion turns in three other directions without becoming a different word:
- getting clear of a threat, so that the coming anger or the edge of the sword never reaches you
- withdrawing out of somebody's reach and staying there, as sheep will not follow a stranger's voice and the devil backs off from someone who resists him
- treating a moral danger the way you would treat a lethal one, running from sexual sin, from idol worship, from the cravings of youth
Those commands to run from sin are phrased as a standing practice rather than a single act, and they usually come paired with something to chase after instead.
At the far end the word goes figurative. Islands disappear, and earth and sky give way before the throne of God, using the old picture of the sea and the mountains taking flight when the Lord appears. It is one motion seen from different angles: a frightened person, a tempted believer, or a mountain melting away on the last day.