At risk of derailing a fascinating side-trip into the language of my ancestors, I would interject a pair of random thoughts pertaining to the original theme of this thread:
(1) Translation of the scripture is of utmost importance, and translations (unfortunately) tend to reflect the
mores of the time in which they were undertaken. For example, the usual translation of the commandment regarding the taking of human life is, "Thou shalt not kill." (KJV) However, modern scholarship rather strongly suggests that a more accurate translation should be, "Thou shalt not murder." Such a translation, of course, would cut off at the knees those who would quote the commandment as a prohibition against the taking of a human life in defense of self or an innocent third party.
(2) Not all Christians are Roman Catholics, of course, but all Roman Catholics are Christians. So it might be interesting to know what the Roman Catholic Church teaches on this topic (even though I am not a Roman Catholic). Here 'tis:
Part 3, Section II, Chapter 2, Article V, Paragraphs 2264-2265 of the "Official Catechism of the Roman Catholic Church" ... "Love toward oneself remains a fundamental principle of morality. Therefore it is legitimate to insist on respect for one's own right to life. Someone who defends his life is not guilty of murder even if he is forced to deal his aggressor a lethal blow, since one is bound to take more care of one's own life than of another's. Legitimate defense can be not only a right but a grave duty for someone responsible for another's life, the common good of the family or of the community."
In short, I see no moral prohibitions or restrictions imposed on a Christian by Christian teachings when it comes to the use of lethal force in self defense.