συνεπιβαίνω
From LSJ
English (LSJ)
A mount together, Arist.HA591b21; τοῦ τείχους on the wall, Plu.TG4; mount a ladder together, Plb.10.13.8. II enter upon or undertake along with, τινι Antipho 2.2.13. III trample on as well, σ. ἐν ταῖς συμφοραῖς τινι J.BJ1.24.8. IV trans., aor. 1 part. -βήσας, cause to mount, πύργοις ἀκοντιστάς ib.3.7.30.