_v. _return, going/coming back. Q. nanwen-. >> damen
Sindarin
damen
verb. return
damen-
verb. to return
dadwen
verb. return
dammen-
verb. to return, go back
dadwen-
verb. to return, go back
A Sindarin verb for “return, go back” as a combination of √(N)DAN “back” and √MEN “go”, contrasted with dandol- “return, come back” appearing in notes from around 1959 (PE17/166). Tolkien first gave this verb as {namen >>} damen reflecting vacillation on the primitive prefix ✱nan- > ✱ndan-. Later in the same notes he gave a form dadwen, reflecting either vacillation of the development of ancient nm in Sindarin (to either dw or mm), or vacillation on the suffix itself ((n)dad- vs. (n)dan-).
Neo-Sindarin: For purposes of Neo-Sindarin, I would use ᴺS. dammen- for this word as the most phonologically plausible. Tolkien represented intervocalic m as both mm and m in Sindarin (e.g. lammad vs. minlamad), so damen- is possible as well. Either way, the pronunciation would be [damen] with short [m].
_ v. _return. Q. nanwen-. >> dan-