ἀντίκρουσις
From LSJ
μὴ ἐν πολλοῖς ὀλίγα λέγε, ἀλλ΄ ἐν ὀλίγοις πολλά → don't say little in many words, but much in a few words (Stobaeus quoting Pythagoras)
English (LSJ)
εως, ἡ,
A abrupt close, in a rhetorical period, Arist. Rh.1409b22; hindrance, check, Plu.2.721b; dub. sens. in Aeschin. 1.168, perh. repartee.
German (Pape)
[Seite 253] ἡ, das Zurückstoßen, Widersetzlichkeit, Plut. Marc. 28; λέγειν ἀντίκρουσιν πρός τινα, deklamatorische Wechselreden halten, Aeschin. 1, 168.