A verb appearing as G. canga- “to tangle” in the Gnomish Lexicon (GL/25), probably based on the early root ᴱ√KANGA or ᴱ√KAŊA “weave, twine” (QL/45, 98). Elsewhere in GL Tolkien had the similar and probably related intransitive verb cinga- or cangi- “to go wrong, get tangled”.
Neo-Sindarin: I would retain the verb ᴺS. canga- for purposes of Neo-Sindarin based on a Neo-Root ᴺ√KANGA “✱tangle”, incorporating the meanings of both transitive “tangle” and intransitive “get tangled, [by extension] go wrong”.
An adverb in the Gnomish Lexicon of the 1910s, a combination of G. go- “together” and G. mintha “in one place” (GL/41).