1. To create a nest of some kind inside of something. There are these birds that started nesting in the trees beside our house that make the most horrible squawking noises at the crack of dawn each day.

2. To rest or nestle into something securely or snugly. The incredibly valuable Fabergé egg nested in an ornate box lined with silk.

3. To rest or nestle something into something else securely or snugly. In this usage, a noun or pronoun is used between "nest" and "in." I nested the bottle in the shirts inside my backpack so it wouldn't break while I rode home on my bicycle.

4. To aide an animal in creating a nest in some place or inside of something. In this usage, a noun or pronoun is used between "nest" and "in." The company pledged to nest the birds that would be affected by the excavation in a different cave.