This is the 10692nd most frequent Spanish word.
defenderlo
"Defenderlo" means "to defend him/it."
In this sentence, 'defenderlo' is used as a verb meaning 'to defend' with the pronoun 'lo' indicating the object of the defense, referring to 'him'.
Voy a defenderlo en el debate esta tarde.
I will defend him in the debate this afternoon.
Here 'defenderlo' expresses the action of acting in protection against accusations for 'him', 'lo' is the direct object pronoun referring to the person being defended.
Es nuestra responsabilidad defenderlo de acusaciones injustas.
It is our responsibility to defend him from unjust accusations.
The usage of 'defenderlo' here describes the attempt made to protect or support 'him' during a discussion, with the object pronoun 'lo' specifying who is being defended.