συμμεταβάλλω
From LSJ
ὁ κόσμος ἀλλοίωσις, ὁ βίος ὑπόληψις → the universe is flux, life is opinion | the universe is transformation: life is opinion | the universe is change, life is a fleeting impression | the universe—mutation: life—opinion
English (LSJ)
A change along with, τύχας χρώμασι καὶ πέπλοις AP15.46.4; ταῖς ὥραις τὰς διαίτας Plu.Luc.39, cf. Gal. 15.734; σ. τοὺς τόπους exchange places simultaneously, Arist.Mete.358b33 (Ald.); σ. τὰς χώρας change their places of abode, Plu.2.424e, cf. Jul.Or.1.13d; τὸ γένος change its gender, A.D.Adv. 184.3:—Med., change sides and take part with, τινι Aeschin.3.165, cf. Luc.Epigr.14.4. II intr. in Act., change with or together, Arist.GA716b4, MA702b23, EN1100a28, Str. 10.2.12, Ph.1.276.