present participle and gerund of defend
"After spending hours defending his thesis, he finally felt ready to leave the conference room."
In plain English: Defending means protecting someone or something from being hurt, attacked, or taken away by others.
"The lawyer spent hours defending her client against the new charges."
attempting to or designed to prevent an opponent from winning or scoring
"The goalkeeper spent the entire match defending, making a series of crucial saves to stop the opposing team from scoring."