εἶθαρ
From LSJ
ὁ μὴ δαρεὶς ἄνθρωπος οὐ παιδεύεται → spare the rod and spoil the child | οne who hasn't been flayed is not being taught | if the man was not beaten, he is not educated | the man, who was not paddled, is not educated
English (LSJ)
Adv.
A at once, forthwith, Il.5.337, Theoc.25.213, Antim.16.5, A.R.2.408, Nic.Th.547.