Uncountable (occasionally countable) gerund meaning the act of undermining oneself.
His constant public complaints were an exercise in self-undermining.
Его постоянные публичные жалобы были проявлением саморазрушения.
self-undermininggerund / present participle Used both attributively and predicatively to describe something that weakens its own position.
Proclaiming that facts do not matter is a self-undermining argument.
Утверждение о том, что факты не имеют значения, — саморазрушительный аргумент.