συναποθνῄσκω
From LSJ
τοῖς πράγμασιν γὰρ οὐχὶ θυμοῦσθαι χρεών· μέλει γὰρ αὐτοῖς οὐδέν· ἀλλ' οὑντυγχάνων τὰ πράγματ' ὀρθῶς ἂν τιθῇ, πράξει καλῶς → It does no good to rage at circumstance; events will take their course with no regard for us. But he who makes the best of those events he lights upon will not fare ill.
French (Bailly abrégé)
mourir avec, τινι.
Étymologie: σύν, ἀποθνῄσκω.
English (Thayer)
2nd aorist συναπεθανον; to die together; with the dative of the person to die with one (Herodotus down): ὑμᾶς ἐμοί, that ye may die together with me, i. e. that my love to you may not leave me even were I appointed to die, τῷ Χριστο (cf. Winer's Grammar, 143 (136)), to meet death as Christ did for the cause of God, 2 Timothy 2:11.