This is the 14720th most frequent German word.
niederzulassen
To settle or establish oneself.
Here, 'niederzulassen' is used in a reflexive sense, indicating the action of establishing oneself in a certain place.
Sie entschied, sich in der kleinen Stadt niederzulassen.
She decided to settle down in the small town.
In this sentence, 'niederzulassen' is used to describe the action of finding a place to stay temporarily, relevant to the movement of birds.
Die Zugvögel bereiten sich vor, um für den Winter niederzulassen.
The migratory birds are preparing to settle down for the winter.
Here, 'niederzulassen' is metaphorically used to describe someone positioning themselves for contemplation.