I.to rub between, rub hard, rub away, consume, waste, Hom.:—Pass., διατρι^βῆναι to perish utterly, Hdt.
2.absol. (without χρόνον), to waste time, pass it away, οὐ μὴ διατρίψεις; i. e. make no more delay, Ar.; δ. ἐν γυμνασίοις to pass all one's time there, id=Ar.; δ. μετ᾽ ἀλλήλων to go on talking, id=Ar.: —hence, to employ oneself on or in a thing, ἔν or ἐπί τινι Plat.; περί τι id=Plat.; c. part., δ. μελετῶν Xen.