'Defend' in the Bible

‘They are fat and they are sleek (prosperous),They excel in acts of wickedness;They do not plead the cause,The cause of the orphan, so that they [the wicked] may prosper,And they do not defend the rights of the poor.

“Their Redeemer is strong; the Lord of hosts is His name.He will most certainly plead their case and defend their causeSo that He may bring rest to their land,But turmoil to the inhabitants of Babylon.