συμπονεῖν
From LSJ
Ἔστιν τι κἀν κακοῖσιν ἡδονῆς μέτρον → Voluptas aliqua inest vel infortunio → Es wohnt im Leid auch ein begrenztes Maß an Lust
Greek > English (Woodhouse Verbs Reversed)
(see also συμπονέω): labor with, labour with, sympathise with in sorrow, sympathise with, take a share in, work with others, work with