Akin to phasko; to malign, i.e. (by extension) to fascinate (by false representations) -- bewitch.
see GREEK phasko
1. to speak ill of one, to slander, traduce him (Demosthenes 8, 19 (94, 19); Aelian v. h. 2, 13, etc.).
2. to bring evil on one by feigned praise or an evil eye, to charm, bewitch one (Aristotle, probl. 20, 34 (p. 926{b}, 24); Theocritus, 6, 39; Aelian nat. an. 1, 35); hence, of those who lead away others into error by wicked arts (Diodorus 4, 6): Galatians 3:1. Cf. Schott (or Lightfoot) at the passage; Lob. ad Phryn., p. 462.