σιγᾶν ἄμεινον ἢ λαλεῖν ἃ μὴ πρέπει → it's better to keep silence than to say what's not appropriate (Menander)
P. and V. πίσσα, ἡ (Aesch., Fragment).
cover with tar, verb transitive: Ar. also P. καταπισσοῦν.