Definitions of retreat:

• noun:   (military) withdrawal of troops to a more favorable position to escape the enemy's superior forces or after a defeat

  Example: "The disorderly retreat of French troops"

• noun:   (military) a bugle call signaling the lowering of the flag at sunset
• noun:   (military) a signal to begin a withdrawal from a dangerous position
• noun:   a place of privacy; a place affording peace and quiet
• noun:   withdrawal for prayer and study and meditation

  Example: "A religious retreat"

• noun:   an area where you can be alone
• verb:   move away, as for privacy

  Example: "The Pope retreats to Castelgondolfo every summer"

• verb:   make a retreat from an earlier commitment or activity
• verb:   pull back or move away or backward
• verb:   move back