And in Wikipedia I found:
"Jettying (jetty, jutty, getee (obsolete) from Old French getee, jette) is a building technique used in medieval timber framed buildings in which an upper floor projects beyond the dimensions of the floor below. This has the advantage of increasing the available space in the building without obstructing the street. In the U.S. this style house became called a garrison house."
(I guess modern French 'jeter = to throw' comes from this root too.)
A small and belated September update for 2024, where I am still, after many years' membership, on 365 Project, also now posting elsewhere but wanting...
Mmm I did think of it.................