1. An archaic term showing a respectful form of address for a king or lord: The squire pledged, "Sire, I give you my loyalty".
2. Another archaic reference to a male ancestor or a forefather: The sire of the present king was a well-known military leader.

Becoming the male parent of an offspring, typically in reference to breeding of exceptional livestock, horses, bulls, etc.: The famous horse sired several generations of exceptional race horses.