Ideographic: A footstep 足 in error 差; 差 also provides the pronunciationRadical:

meaning for cuō:

  • - to error
  • - to slip
  • - to miss
  • - to err(literary) to slip
  • - (of looks etc) to fade away
  • - (of time) to slip away
  • - to squander (time, opportunities)
  • - to dillydallythe years have already gone by
  • - to be too oldthe years have slipped by