Lexical Definition

‎συναποθνήσκω‎ synapothnḗskō (soon-ap-oth-nace'-ko) to die with ^G:V
from ‎σύν‎ and ‎ἀποθνήσκω‎

be dead (die) with.

• to decease (literally) in company with, or (figuratively), similarly to

Abbott-Smith

** συν-απο-θνήσκω [in LXX: Si 19:10 * ;]
to die with or together: Mk 14:31, II Co 7:3 (v. Meyer, in l.), II Ti 2:11.†

Abbott-Smith References

Liddell-Scott-Jones

συναποθνήσκω-θνήσκω,

die together with, τινι [NT+5th c.BC+]; συναποθνήσκωθνῄσκοντες, title of comedy by Diphilus, Ter.[Refs 5th c.BC+]; σ. νοσήματα, i.e. cling to one until death, [Refs 5th c.BC+]

_{LSJ Scripture Refs: 2Cor.7.3}