Echar la soga tras el caldero

[EXELMARK]

Hola:
¿Que quiere decir este modismo?:

Echar la soga trás el caldero?

[poli]

From what I can tell it means to lose something important

[Rusty]

It means "Throw away the main item after losing an accessory." (Dejar pedir lo accesorio, perdido ya lo principal.)
It's akin to the saying, "Throw good money after bad."
Another possible match: "Throw the baby out with the bath (water)."