ἱπποτροφεῖν

From LSJ

γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at

Source

Greek > English (Woodhouse Verbs Reversed)

(see also: ἱπποτροφέω) be a horse-breeder, breed horses, keep a stud