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ἐρίζειν

Γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ -> The fool laughs even when there's nothing to laugh at
Menander

Greek > English (Woodhouse Verbs Reversed)

ἐρίζειν = (see also ἐρίζω): contend, quarrel, argue with, be at odds, be at variance with, compete with, contend with, disagree with, discuss with, dispute with, emulate a person, quarrel with

⇢ Look up "ἐρίζειν" on Google | Wiktionary | LSJ full text search (Translation based on the reversal of Woodhouse's English to Ancient Greek dictionary)