not know A from a windmill

To be stupid. It references the vaguely similar shape of the letter A and a windmill. How do you manage to burn pasta? It's like you don't know A from a windmill.

See also: know, not, windmill

See also:

boil (something) away
boil away
boiling
not beat about the bush
not beat around the bush
beat about the bush
beat around/about the bush, to
beat around the bush
allude to
allude to (something)

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