κρουστέον Save κρουστέον, one must knock at LSJ Bailly 2024 Grieks Nederlands κρουσ-τέον, one must knock at, τηνδεδί (sc. θύραν) Ar. Ec. 989. κρουστέον, vb. de κρούω, Ar. Eccl. 989. κρουστέον, adj. verb. van κρούω, er moet gebeukt worden.