not know B from a battledore

To be really stupid, or perhaps illiterate. The now-outdated term "battledore" was often used in reference to a children's primer. It was likely used in this phrase simply for the sake of alliteration. How do you manage to burn pasta? It's like you don't know B from a battledore.

Common Names:

Name	Pronounced	Usage
Hilditrut	-	Ancient Germanic
Hristina	-	Bulgarian, Macedonian, Serbian
ÓRlaith	OR-la	Irish
Elanor	-	Literature
Galena	-	Bulgarian, Macedonian
Pherick	-	Manx