στικτέον
From LSJ
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
English (LSJ)
A one must put a punctuation mark (στιγμή), Sch.Il.2.173, al.
Greek (Liddell-Scott)
στικτέον: ῥηματ. ἐπίθ., πρέπει τις νὰ θέσῃ στιγμήν, Σχόλ. εἰς Ἰλ. Β. 173, κ. ἀλλ.