συμβάλλεσθαι
From LSJ
εὖτ' ἂν ὑπὸ τοῦ κακοῦ κτεινέωνται → when the disease is proceeding towards a fatal termination
Greek > English (Woodhouse Verbs Reversed)
(see also συμβάλλω): coincide, conduce to, correspond, be a factor in, be instrumental in, contribute to, contribute towards a result, contribute towards, help to