It comes from the old English word dubbian (to strike with a sword), used when a king or knight tapped someone on the shoulders to grant them knighthood.
You will often see the phrase written as The difference is purely linguistic: “I dub thee, Sir…” — Knights in Shining Armour i dub you meaning
In the past, when a man was about to be knighted, the ceremony included the phrase "I dub thee," which was a way of saying "I confer upon thee the honor of knighthood." The phrase was often followed by "Sir," and the person's new title. It comes from the old English word dubbian
The phrase "I dub thee" comes from the Old English words "dub" or "dob," which mean "to strike" or "to beat." In this context, when a knight was dubbed, it meant that the person conferring the knighthood would strike or tap the candidate on the shoulders or neck with a sword. : Replacing the original voice in a film
: Replacing the original voice in a film with a different language (e.g., "The anime was dubbed in English").
Sarah laughed and gave him a playful tap on the shoulder with a rolled-up memo.
The sovereign would declare, "I dub you knight" or "I dub thee Sir [Name]" .