WordNet sense 1 (an area where you can be alone):

hideaway

WordNet sense 2 (move back):

retrograde

WordNet sense 3 (pull back or move away or backward):

recede, retire, withdraw, pull back, move back, pull away

WordNet sense 4 (make a retreat from an earlier commitment or activity):

crawfish, back out, back away, crawfish out, pull in one's horns

WordNet sense 5 (withdrawal for prayer and study and meditation):

retirement