σπένδεσθαι
From LSJ
καὶ παρὰ δύναμιν τολμηταὶ καὶ παρὰ γνώμην κινδυνευταὶ καὶ ἐν τοῖς δεινοῖς εὐέλπιδες → they are bold beyond their strength, venturesome beyond their better judgment, and sanguine in the face of dangers
Greek > English (Woodhouse Verbs Reversed)
(see also σπένδω): make a treaty, make a truce, make peace with, make treaty with, strike a treaty