συμμανθάνω
From LSJ
ἀκίνδυνοι δ' ἀρεταὶ οὔτε παρ' ἀνδράσιν οὔτ' ἐν ναυσὶ κοίλαις τίμιαι → but excellence without danger is honored neither among men nor in hollow ships
English (LSJ)
A learn along with, share in the knowledge, τινι X.Smp. 2.20; ὁ συμμαθών one that is accustomed to a thing, Id.An.4.5.27; οὐδεὶς ἐπίσταταί με συμμαθεῖν τόπος no place knows that I have shared its secret, S.Aj.869 (lyr., s.v.l.; διδάξαι Sch.).