Origin: AS. Nest; akin to D. & G. Nest, Sw. Naste, L. Nidus, for nisdus, Skr. Nia resting place, nest; cf. Lith. Lizdas, Arm. Neiz, Gael. & Ir. Nead. Prob. From the particle ni down, Skr. Ni _ the root of E. Sit, and thus orig, a place to sit down in.
3. A snug, comfortable, or cozy residence or situation; a retreat, or place of habitual resort; hence, those who occupy a nest, frequent a haunt, or are associated in the same pursuit; as, a nest of traitors; a nest of bugs. A little cottage, like some poor man's nest. (Spenser)
6. (Science: mechanics) A compact group of pulleys, gears, springs, etc, working together or collectively. Nest egg, an egg left in the nest to prevent the hen from forsaking it, and to induce her to lay more in the same place; hence, figuratively, something laid up as the beginning of a fund or collection.