From on- + go.
ongo (third-person singular simple present ongoes, present participle ongoing, simple past onwent, past participle ongone)
- To be ongoing (occurring, happening); to last, proceed or continue.
1981, Colin Fletcher, The Man from the Cave, page 164:
And it ongoes far longer than Bill had intended.
1987, The Hemingway Review - Volume 7, page 103: we made way through town the main street blocked by broken houses and a smashed water main and stopping tried get policeman[sic] shoot a wounded horse but owner thought was still possibly worth saveing[sic] and onwent up toward mountain pass that leads to little catalan city of falset para
1996, David Rosenberg, Communion: Contemporary Writers Reveal the Bible in Their Lives:
In two other senses, however, the astrophysical creation story ongoes still:
2013, Hilde Hasselgård, Jarle Ebeling, Signe Oksefjell Ebeling, Corpus Perspectives on Patterns of Lexis, →ISBN, page 233:
The discussion of the appropriateness of using the finite verb forms in examples (28) and (29) shows that the lexicalization process continues (or indeed “ongoes”), and it also gives some indication as to how the introduction process actually works in CMC.