χαλαστέον
From LSJ
αἰὼν παῖς ἐστι παίζων, πεσσεύων∙ παιδός η βασιληίη → time is a child playing draughts; the kingship is a child's | a life-time is a child playing, playing checkers: the kingship belongs to a child | a whole human life-time is nothing but a child playing, playing checkers: the kingship belongs to a child | lifetime is a child at play, moving pieces in a game; kingship belongs to the child
English (LSJ)
one must relax, Herod.Med. in Rh.Mus.58.91, Gal.Sect.Intr.7.
Greek (Liddell-Scott)
χαλαστέον: δεῖ χαλᾶν, Σωρ. Ἐφ. ἔκδ. Erm. σ. 81.