Why Do Catholics Do That?

                                 Why do Catholics call Jesus, "Lord"?

                                 The word "lord" refers to someone having power or authority.  When we call Jesus, "Lord", we acknowledge his power over sin and death as evidenced by his Crucifixion and Resurrection.  We dedicate ourselves to his service. 
                                  "The New Testament uses this full sense of the title 'Lord' both for the Father and ......... for Jesus, who is thereby recognized as God himself" (Catedhism of the Catholic Church, #446).  Therefore, Christians bend our knees to him as our Lord and no one else.