Stifle yourself, Edith

There is now a creative and funny program on a cable channel in the states called "Curb Your Enthusiasm". The title phrase is one I've heard all my life, with no sense of its origin or history. Can anyone help?
I can remember hearing, "Curb your tongue, knave!" In other words, "Be quiet!" or "Shut up!"

There is also the gentle reminder to, "Curb your dog!" meaning "Please have your dog do its business at the side of the road."

I am unsure of its origin.

I found a reference to similar catchphrase - "Desist! Curb your hilarity!" That was a "quip" used by George Robey. From Dictionary of Catch Phrases: American and British, from the Sixteenth Century to the Present Day by Eric Partridge, updated and edited by Paul Beal, Scarborough House, Lanham, Md., 1992)

I don't know if the two phrases are related.

"Curb your enthusiasm" is an ironic remark made when the speaker's suggestions or comments have met with a total absence of enthusiasm. It's a humorous acknowledgment that one's ideas have gone over like a lead balloon. SS

Curb/kerb - to restrain in the way that a kerb-stone rises up from the surface and restrains the roadway. More important before the days of tarmac - to have a walkway above the mud was welcome. In the US as well as sidewalks, there are boardwalks which do the job - especially in areas outside the conurbations, whereas in the Old World, there appears little alternative to the pavement.

I have a feeling that word 'curb' for restraint came from dealing with horses - as do other well-used words like 'bridle','hobble' and 'rein'.

Archie Bunker, a famous American philosopher who was on a long ago show called All in the Family, used another expression like this...........'stifle yourself, Edith.'