lug

root. be heavy

A root in The Etymologies of the 1930s glossed “be heavy”, with the derived adjectives ᴹQ. lunga and N. lhong of the same meaning (Ety/LUG¹). Given the appearance of G. lung “heavy; grave, serious” in the Gnomish Lexicon of the 1910s, I think the idea for this root dates back to this period, though the related verb G. luntha- “balance, weigh” indicates the Early-period root may have been ✱ᴱ√LUŊU instead (GL/55). Tolkien’s continued used of Q. lungu- and S. -lung for “heavy” in his later writings indicates its ongoing validity (S/185; PE17/162; VT47/19).

lug

root. *blue

angwa

root. snake

The root √ANGWA “snake” with variant √ANGU appeared in The Etymologies of the 1930s as the basis for the words ᴹQ. ango “snake” (Ety/ANGWA) and angulóke “dragon” (Ety/LOK). The Noldorin equivalent am- seems to have survived only as a prefix (Ety/ANGWA), and is a good example of how [[on|[ŋgw] > [mb]]] in that language. There are a variety of other words for “snake” in Tolkien’s later writings, so whether this root remained valid is unclear.

dag

root. dig

A rejected root in The Etymologies of the 1930s glossed “dig” (Ety/DAG), it may have been a transient replacement for √SAP.