What is the meaning of Nook?

A small corner formed by two walls; an alcove.

A hidden or secluded spot; a secluded retreat.

A recess, cove or hollow.

An English unit of land area, originally 4 of a yardland but later 12+2 or 20 acres.

A corner of a piece of land; an angled piece of land, especially one extending into other land.

(Should we delete this sense?) The vagina-like genitalia of a troll, featured in Homestuck fanworks but not in canon.

To withdraw into a nook.

To situate in a nook.

Source: wiktionary.org