Meaning of “retreat” - Learner’s Dictionary

retreat

noun uk us /rɪˈtriːt/
MOVE [ U, no plural ]

a move away, especially to a place or situation that is safer or quieter:

He saw the dog coming towards him and beat a hasty retreat (= moved quickly away).
MILITARY [ C, U ]

a move back by soldiers or an army, especially to avoid fighting:

a strategic retreat
PLACE [ C ]

a quiet place where you can go to rest or be alone:

a mountain retreat

(Definition of “retreat noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)