slipped disk

/S L IH1 P T D IH0 S K/
noun
  1. 1

    A vertebral disc that protrudes into the spinal canal, exerting pressure on spinal nerves and causing backache or sciatica.

Source: https://en.wiktionary.org/wiki/slipped%20disc, https://en.wiktionary.org/wiki/slipped%20disk