"new verbs" ??

Sorry, I was thinking more along the lines of my answer above, generically covering all kinds of zero morphology in English: e.g., verbed nouns (or denominal verbs), nouned verbs (or deverbal nouns), nouned adjectives (deadjectival nouns). Examples of retroactively irregularized verbs might be dove for dived,


Ceci n'est pas un seing.