E’ andato in cavalleria

A purpose, a promise, an idea passes to chivalry, it is forgotten, lost, no longer recoverable. We fly over, let something disappear in the drawer of past things. It comes from the military, when the cavalry requisitioned the assets of the infantrymen, believed to be an inferior military corps and therefore subject to abuse and kidnappings. the possessions of the infantrymen once passed into cavalry were no longer recoverable.
Sometimes to go into cavalry is a premeditated action, in order to leave out something that was “said” to do or want to do.