ματαιοκόπος

From LSJ

πρὶν τοὺς ἰχθῦς ἑλεῖν σὺ τὴν ἅλμην κυκᾷς → you're mixing the sauce before catching the fish | don't count your chickens before they are hatched | don't count your chickens before they hatch | first catch your hare | first catch your rabbit | first catch your rabbit and then make your stew | first catch your hare, then cook it | first catch your hare, then cook him

Source

Greek (Liddell-Scott)

ματαιοκόπος: -ον, ὁ ματαίως κοπιῶν, Ἀντ. Μον. 1469Α.

Greek Monolingual

ματαιοκόπος, -ον (Μ) αυτός που μάταια κοπιάζει.
[ΕΤΥΜΟΛ. < μάταιος + κόπος (πρβλ. λαμνοκόπος)].