μονομαχεῖν
From LSJ
ὤδινεν ὄρος, Ζεὺς δ' ἐφοβεῖτο, τὸ δ' ἔτεκεν μῦν → the mountain was in labor — even Zeus was afraid — but gave birth to a mouse
Greek > English (Woodhouse Verbs Reversed)
(see also μονομαχέω): engage in single combat with, engage in single combat, fight a duel, fight man to man