συναποθνῄσκω
From LSJ
ὥστε ὁ βίος, ὢν καὶ νῦν χαλεπός, εἰς τὸν χρόνον ἐκεῖνον ἀβίωτος γίγνοιτ' ἂν τὸ παράπαν → and so life, which is hard enough now, would then become absolutely unendurable
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.