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
ο (AM κάμπανος, Μ και καμπανός)νεοελλ.το πλήκτρο του κώδωνα, το γλωσσίδιμσν.1. βάρος2. μήκος3. σκίρτημαμσν.-αρχ.ζυγαριά, στατήρας, καντάρι.[ΕΤΥΜΟΛ. < μτγν. λατ. campana].