An untranslated verb in notes from around 1962 along with a full paradigm of pronominal suffixes (PE17/131-132). The Etymologies of the 1930s had N. galo “to grow” under the root ᴹ√GALA “thrive” (Ety/GALA), and the later Sindarin verb probably has the same meaning.
Conceptual Development: The Gnomish Lexicon of the 1910s had G. {cal- >>} caltha- “wax, grow, flourish” based on the early root ᴱ√cala having to do with growth (GL/25). Gnomish Lexicon Slips modifying that document had altha- “to shoot up, grow (high)” (PE13/109).
A neologism for “to become” coined by Paul Strack in 2023 specifically for Eldamo, the Sindarin derivative of ✶olā- from the early 1950s of the same meaning. Fiona Jallings proposed ᴺS. ol- instead based on late 1940s verb ᴹQ. ol- “become”, but I prefer to use ᴺS. ol- < √UL for “to pour”.