settle into

(使)习惯于...(使)适应...

settle yourself into the new class 使你自己融入到新的班级里。

The animals quickly settle into the zoo. 动物们很快适应了动物园的生活。

the rain finally settled into a quieter drizzle.

雨最终小下来，变成安静些的毛毛雨。

这里settle的意思是安静下来，平静下来。