Etymology
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nest (v.)

Middle English nesten, from Old English nistan "to build (a bird's) nests, to make or live in a nest," from Proto-Germanic *nistijanan, from the source of nest (n.). The modern verb is perhaps a new formation in Middle English from the noun. Related: Nested; nesting.

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nest (n.)

"structure built by a bird or domestic fowl for the insulation and rearing of its young," Old English nest "bird's nest; snug retreat," also "young bird, brood," from Proto-Germanic *nistaz (source also of Middle Low German, Middle Dutch nest, German Nest; not found in Scandinavian or Gothic), from PIE *nizdo- (source also of Sanskrit nidah "resting place, nest," Latin nidus "nest," Old Church Slavonic gnezdo, Old Irish net, Welsh nyth, Breton nez "nest"), probably from *ni "down" + from PIE root *sed- (1) "to sit."

From c. 1200 of an animal or insect. Used since Middle English in reference to various accumulations of things, especially of diminishing sizes, each fitting within the next (such as a nest of drawers, early 18c.). Nest egg "retirement savings" is from 1700; it was originally "a real or artificial egg left in a nest to induce the hen to go on laying there" (nest ei, early 14c.), hence "something laid up as the beginning of a continued growth."

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crows-nest (n.)

"box fitted up the maintopmast or maintopgallant on arctic and whaling vessels for the shelter of the lookout man," 1818; see crow (n.) + nest (n.).

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nesting (adj.)
1650s, "making or using a nest," present-participle adjective from nest (v.). Of objects, "fitted into one another," from 1934.
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nestling (n.)

"young bird, bird too young to leave the nest," late 14c., from nest (n.) + diminutive suffix -ling. Compare Middle Dutch nestelinc.

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nidus (n.)

"nest, breeding place," especially the case or cell formed by an insect or spider for reception of its eggs, 1742, from Latin nidus "a nest," from Old Latin *nizdus (see nest (n.)). Figurative use by 1807. Classical plural is nidi.

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nestle (v.)

Middle English nestlen, from Old English nestlian "build a nest, make or live in a (bird's) nest," from nest (see nest (n.)) + suffix -el (3). Figurative sense of "settle (oneself) comfortably, snuggle" is recorded by 1540s. In Middle English also "take shelter as if in a nest." Related: Nestled; nestling.

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nidification (n.)

"nest-building, the act or art of constructing nests," 1650s, from Latin nidificatus, past participle of nidificare, from nidus "a nest" (see nest (n.)) + -ficare, combining form of facere "to make," from PIE root *dhe- "to set, put." Related: Nidify "to build a nest" (1650s).

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nidicolous (adj.)

of birds, "bearing young which are helpless at birth," 1896, from Modern Latin Nidicolae (1894), the zoologists' collective name for the species of birds having the young born in a more or less helpless condition, unable to leave the nest for some time and fed directly by the parent, from Latin nidus "nest" (see nest (n.)) + colere "to inhabit" (see colony). Contrasted to nidifugous birds (1902), whose young are well-developed and leave the nest at birth (from Latin fugere "to flee").

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*sed- (1)

Proto-Indo-European root meaning "to sit."

It forms all or part of: assess; assiduous; assiento; assize; banshee; beset; cathedra; cathedral; chair; cosset; dissident; dodecahedron; Eisteddfod; ephedra; ephedrine; ersatz; icosahedron; inset; insidious; nest; niche; nick (n.) "notch, groove, slit;" nidicolous; nidification; nidus; obsess; octahedron; piezo-; piezoelectric; polyhedron; possess; preside; reside; saddle; sanhedrim; seance; seat; sedan; sedate; (adj.) "calm, quiet;" sedative; sedentary; sederunt; sediment; see (n.) "throne of a bishop, archbishop, or pope;" sessile; session; set (v.); sett; settle (n.); settle (v.); siege; sit; sitz-bath; sitzkrieg; size; soil (n.1) "earth, dirt;" Somerset; soot; subside; subsidy; supersede; surcease; tanist; tetrahedron; Upanishad.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit a-sadat "sat down," sidati "sits," nidah "resting place, nest;" Old Persian hadis "abode;" Greek ezesthai "to sit," hedra "seat, chair, face of a geometric solid;" Latin sedere "to sit; occupy an official seat, preside; sit still, remain; be fixed or settled," nidus "nest;" Old Irish suide "seat, sitting," net "nest;" Welsh sedd "seat," eistedd "sitting," nyth "nest;" Old Church Slavonic sežda, sedeti "to sit," sedlo "saddle," gnezdo "nest;" Lithuanian sėdėti "to sit;" Russian sad "garden," Lithuanian sodinti "to plant;" Gothic sitan, Old English sittan "to sit."

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