what does "bay" mean here

Question

The President was correct. I mean, really, ISIS was at bay.

Special Forces pulling out of northern Syria has now turned into a full withdrawal of the thousand or so service members who are participating in what by almost all accounts was a successful and low risk operation to keep ISIS at bay.
And I wonder, you know, what are the consequences for that? And what does the US do next to help those who kept the ISIS threat at bay, really both stay alive, and also figure out how to keep the extremist threat ended.

Answer 1

Keep something at bay

چیزی رو دور نگه داشتن؛ سد چیزی شدن؛ مانع چیزی شدن؛ در تنگنا قرار دادن