Meaning of “retreat” - Learner’s Dictionary

retreat

verb [ I ] uk us /rɪˈtriːt/

When soldiers retreat, they move away from the enemy, especially to avoid fighting:

The army was forced to retreat.
retreat to/into, etc

to go away to a place or situation that is safer or quieter:

She retreated into the bathroom for some peace and quiet.

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