outflow of refugees; refugee exodus
Refers to a large-scale movement of refugees out of a region, often due to conflict or disaster.
The outflow of refugees continues due to the conflict.
The refugee exodus to neighboring countries has become a serious problem.
難民 means 'refugee'; 難民流出 specifically refers to the outflow or exodus of refugees.
流出 means 'outflow' or 'drain' in general; 難民流出 narrows it to the outflow of people as refugees.
Compound of 難民 (refugee) and 流出 (outflow).