not know B from a battledore

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Related to battledore: battledore and shuttlecock, stinkhorn

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 The now-outdated term "battledore" was often used in reference to a children's primer.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.
See also: know, not
References in periodicals archive ?
Also, the diagnosis of Battledore placenta by ultrasound is possible and is better done in second trimester as localization of the site of cord insertion becomes difficult with increasing gestational age (12).
Battledore placentae were associated with the anomalies of placentae as well as related to abnormal conditions of the mother and foetus.
Two of these horn-books and one battledore are described here.
Battledore and shuttlecock is simply played by two hitting a shuttlecock backwards and forwards with a simple bat or small racquet as many times as they can allowing it to hit the ground.
Yukio Minamikawa, head of a guild of battledore makers and sellers at Sensoji temple, said he expects many customers to visit the place and buy the battledores during the event.
Insertion of cord was eccentric 68%, central 24%, battledore 6% and velamentous 2% in IUGR group as compared to 90% central and 10% Eccenteric in control group, i.
The ''Princess Masako'' battledore shows the crown princess carrying a baby, celebrating the birth Saturday of the first child to her and Crown Prince Naruhito.
May I take up the dialectic battledore which you have just laid down?
It is an ideal opportunity for youngsters - and their parents - to try out traditional games including hopscotch, skittles, croquet, quoits, battledore and shuttlecock.
Cheltenham Festival winners: Battledore (1968 National Hunt Handicap Chase), Credit Call (1972 Foxhunters' Chase), The Thinker (1987 Cheltenham Gold Cup)
Placentas with variations in insertions of umbilical cord like marginal or battledore placentas and velamentous cord insertions were excluded from study.
Then came an early form of the game called battledore and shuttlecock ( known as poona in eighteenth-century India.
Much of the action takes place beside Berwick's Magdalene Fields Golf Course, beside the earthwork walls, and among the attractions will be bandy, shovelboard and battledore, staged by living history group Heuristics.
the region of song and poetry" as a grimy cesspool, clouded in an "unwholesome vapour," populated by "dirty men, filthy women, squalid children, fluttering shuttlecocks, noisy battledores, reeking pipes, bad fruit, more than doubtful oysters, attenuated cats, depressed dogs, and anatomical fowls.