Gerund used as an uncountable noun referring to the act or process of declaring someone ineligible
Definitions
The act or process of declaring someone ineligible or unfit for a position, activity, or competition. The disqualifying of the candidate sparked widespread debate.
disqualifygerund / present participle Used attributively as an adjective, e.g. "a disqualifying offence"
Definitions
Causing or constituting grounds for disqualification; rendering someone or something ineligible. A disqualifying error in his application led to its rejection.