verb · physically loose, slack, or no longer firmly fixed in place

他的牙齿开始有些松动了。

verb · to become less rigid or strict regarding policies, attitudes, or tones of voice

看到孩子一直在哭，母亲的口气终于松动了。

verb · describing a space that is not packed or has become less congested

避开高峰期以后，地铁里松动了许多。