Dr. Lerer was talking about the compression of syllables at the border of Old English and Middle English circa 1100 which occurred in such terms as hlaf weard, the warden (or guardian) of the loaf.
Who is the guardian of the loaf? The hlfaf weard << The hlaweard << the laweard << the lord. This is the etymology of the word 'lord'. Lord is the guardian of the bread, the mete-er out of bread in a cereal society.
An interesting linguistic change that tells us a lot about power, structure, religion, and society surrounding bread of the time. I suppose one could also look at Christian traditions of the time which looked at the transubstantiation of the symbolic bread of the Last Supper which is ritually turned into the body of Christ–Christ, our lord.