neath

The word 'neath' is a poetic or archaic shortening of 'beneath'. Its ancestor, 'beneath', originates from Old English 'beneothan', a compound of 'be-' (by, about) and 'neothan' (below). 'Neothan' itself is derived from the comparative form of the Proto-Germanic root niþer, meaning "down" or "under", which is also the source of 'nether'. The contraction to 'neath' occurred in Middle English, streamlining the word for metrical use in poetry while retaining its core directional meaning of being in a lower position.

This word is a simplex form, derived from the Middle English 'nethe', which is a shortened form of 'beneathe' (beneath). It is not productively composed of separable morphemes in modern English.