σύρρευσις
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
English (LSJ)
εως, ἡ,
A flowing together, conflux, Arist.HA551b28, Corn. ND30; the form σύρρῠσις in Plb.9.43.5, D.S.1.39, D.H.Comp.16, etc.