παρεμβαίνω
From LSJ
ἀσκεῖν περὶ τὰ νοσήματα δύο, ὠφελεῖν ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
A fit in, εἰς ἐπιτομήν Ph.Bel.66.39 ; go in beside another, Plu.2.593f ; τεθρίππῳ π. to be mounted beside another on... D.H.2.34 ; ἐφ' ἁρματίου Id.5.47, etc.
German (Pape)
[Seite 514] (s. βαίνω), daneben einherschreiten, aufsteigen (ans Land), Plut. gen. Socr. 23; τεθρίππῳ παρεμβεβηκώς, D. Hal. 2, 34, wie ἅρματι 8, 67; παρ. ἐφ' ἁρματίου δίφρου, 5, 47, vom Triumphator; a. Sp.