οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
subs.
Ar. and P. διάρροια, ἡ.
They suffered from diarrhoea: κάτω διεχώρει αὐτοῖς (Xen., Anab. 4, 8, 20).
