συλλείβω
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 collect by streams, τὸ ὕδωρ Arist.Mete.350a9:—Pass., [τὸ καταμηνιῶδες περίττωμα] συλλείβεται εἰς αὐτὴν τὴν ὑστέραν Id.GA 751a5; of blood, a flow takes place, Hp.Oss.15, cf. Virg.1; of rivers, ἐκ πλειόνων πηγῶν συλλείβεσθαι Demetr.Sceps. ap. Str.13.1.43.
German (Pape)
[Seite 975] zusammengießen, verschmelzen, Arist. meteor. 1, 13. – Pass. zusammenfließen, Plut. Aem. P. 14 Luc. Alex. 13.