Jill Of All Trades Meaning

(idiomatic) A woman competent in many endeavors, especially one who excels in none of them.

Example: 1988, Janette Turner Hospital, Charades, University of Queensland Press (2003), ISBN 0702233889, page 268:
  Sitting in a dive in Central Square, the one where she works as a dishwasher, barmaid, jill of all trades (illegal, no papers, below-the-minimum cash payments, afternoon and early evening shifts), she stared into a mug of beer and told herself: There comes a point.
2000, Amy Einsohn, The Copyeditor's Handbook: A Guide for Book Publishing and Corporate Communications, University of California Press (2000), ISBN 0520218345, page 64:
  If you intend to work primarily in one field, that approach would be reasonable. But if you aspire to be a jack or jill of all trades, you may want to begin by looking at some general guides for nonspecialized writers.
2012, Ruth Hamilton, The Bells of Scotland Road, Macmillan (2012), ISBN 9781447209461, unnumbered page:
  Sister Josephine was a jill of all trades. She served as bursar, school secretary, meals supervisor, welfare officer and troubleshooter.