IPA: /rɪˈtriːtə/
KK: /rɪˈtriːtər/
A person who moves back or withdraws from a situation, often for safety or to avoid conflict.
The retreater found a quiet place in the mountains to reflect and recharge.
Retreater → It is formed from "re-" (meaning back or again) and "treat" (from Old French *traiter*, meaning to handle or deal with). The suffix "-er" indicates a person who performs an action. Thus, a retreater is a person who withdraws or goes back from a situation.
Think of someone going 'back' ('re-') to 'handle' or 'deal with' something ('traiter') — that's why a retreater is someone who withdraws.