κατάρχ-ω,
make beginning of a thing, c.genitive, τίνες κατῆρξαν.. μάχης; [[ 4th-5th c.BC: Aeschylus Tragicus “Pers.” 351; ὁδοῦ κατάρχειν] Refs 4th c.BC+] lead the way, [[ 5th c.BC: Sophocles Tragicus “OC” 1019; δεινοῦ λόγου [prev\. author] “Tr.” 1135; λόγων Χρησίμων Aristophanes Comicus [{5-6th c.BC}] “Lysistrata” 638, compare 5th-6th c.BC: Plato Philosophus “Prt.” 351e, etc.; τραυμάτων 1st c.BC: Asclepiodotus Tacticus “Tact.” 7.1 ] Refs 6th c.BC+]; τὸ κατάρχον αἰσθήσεως, τῆς κινήσεως, the source of perception, of motion, [[ 2nd c.AD: Galenus Medicus 5.588: rarely with _accusative_ ] Refs 2nd c.AD+], begin a thing, [[ θαυμαστόν τινα λόγον Plato Philosophus [{5-6th c.BC}] “Euthydemus” 283b ] Refs 6th c.BC+]: with participle, begin doing, [[ 5th-6th c.BC: Xenophon Historicus “Cyr.” 1.4.4, 4.5.58: _absolutely_, 5th-6th c.BC: Plato Philosophus “Smp.” 177e, 4th c.BC: Aristoteles Philosophus “Mu.” 399a15. ] Refs 5th c.BC+]
__2 θανόντα δεσπόταν γόοις κατάρξω I will lead the dirge over.., [[ 5th c.BC: Euripides Tragicus “Andr.” 1199 (Lyric poetry, with reference to the religious sense, below 11.2). ] Refs 5th c.BC+]
__II middle, begin, like active, with genitive, [[ ἐχθρᾶς ἡμέρας κατάρχεται [prev\. author] “Ph.” 540; τοῖς κατηργμένοις τῆς πορείας Plato Philosophus [{5-6th c.BC}] “Phaedrus” 256d; κ. τῆς προσβολῆς 2nd c.BC: Polybius Historicus 2.67.1; τοῦ λόγου Plutarchus Biographus et Philosophus [{1-2nd c.AD}] 2.151e ] Refs 6th c.BC+]: with accusative, κ. νόμον, στεναγμόν, [[ 5th c.BC: Euripides Tragicus “Hec.” 685 (assuming variant), “Or.” 960 (both Lyric poetry): _absolutely_, κατάρχεται μέλος] Refs 5th c.BC+] is beginning, [[ [prev\. author] “HF” 750 (Lyric poetry), compare 891 (Lyric poetry); τὸ -άρξασθαι Aelianus [{2-3rd c.AD}] “Tactica - Griechische Kriegsschriftsteller” 17 ] Refs 2nd c.AD+].