suegra
/ˈsweɡɾa/ · B2 · noun · f
nitrogen
🍞 suegra = mother-in-law; the crusty bread heel is the tough 'old' end
Suegra literally means mother-in-law. Its slang sense, the heel or butt of a loaf, likely comes from that end being hard and tough, like a stern in-law. The coin sense (one colón) is a separate Salvadoran colloquial use.