to rest yourself or part of your body in a warm, comfortable, and protected position

She nestled (her head) against his shoulder. 她（把头）靠在他肩膀上。

to be in, or put something in, a protected position, with bigger things around it

Bregenz is a pretty Austrian town that nestles between the Alps and Lake Constance. 布雷根茨是一个漂亮的奥地利小镇，坐落在阿尔卑斯山和康斯坦茨湖之间。