ἀντιπαρέχω
From LSJ
τοῦ δὲ πολέμου οἱ καιροὶ οὐ μενετοί → in war, opportunities won't wait | the chances of war will not wait (Thucydides 1.142.2)
English (LSJ)
A furnish or supply in turn, Th. 6.21:—also in Med., X.Hier.7.12; supply mutual need, τοὐλλιπὲς ἀλλήλοις AP9.12 (Leon.). 2 cause in return, τοὺς ἀντιπαρέξοντας πράγματα D.21.123.