A.breathe together with, τινι M.Ant.8.54, AP7.595 (Jul.): metaph., ἐμπαίοις τύχαισι συμπνέων going along with the sudden blasts of fortune, yielding or bowing to them, A.Ag.187 (lyr.); συμπνέον τῇ ὀργῇ, gloss on ἔγχεος ζακότοιο, Sch.Pi.N.6.90.
2. abs., coalesce, achieve unity, Pl.Lg.708d, Arist.Pol.1303a26, Plu.Comp.Lyc.Num.4; “συμπνευσάντων ἡμῶν καὶ Θηβαίων” D.18.168; “οἱονεὶ ς. ἐς γάμον” Ael.NA 3.44.