failing

FAILING noun

[ C ] uk/ˈfeɪlɪŋ/ us
a bad quality or fault that someone or something has

недостаток
Despite one or two failing s, he's basically a nice guy.
failing preposition uk/ˈfeɪlɪŋ/ us   failing that
if something is not possible or does not happen

если это не удастся, в случае неудачи
Our goal is to move out by January, or failing that, by March.