defence mechanism

/D IH0 F EH1 N S M EH1 K AH0 N IH0 Z AH0 M/
noun
  1. 1

    A psychological strategy used unconsciously by people to cope with harmful or stressful situations.

  2. 2

    An automatic reaction of the body against foreign antibodies.

Source: https://en.wiktionary.org/wiki/defence%20mechanism, https://en.wiktionary.org/wiki/defense%20mechanism