1. to join or assist in accomplishing , (Euripides):—;Mid. συμπεραίνεσθαί τινι ἔχθραν to join fully in enmity with another, (Demosthenes Orator)

2. to decide or conclude absolutely , ς. φροντίδα to make up one's mind, (Euripides); κλῇθρα μοχλοῖς ς. to make the doors doubly sure by bars, (Euripides):—;Pass. to be quite finished , (Xenophon Historicus) (ML)