backshift

/B AE1 K SH IH0 F T/
noun
  1. 1

    (grammar) The changing of the tense of a verb from present to past in reported speech.

  2. 2

    A function on a stochastic process whose value on any random variable is the preceding random variable in the process.

verb
  1. 1

    (grammar) To change the tense of a verb from present to past in reported speech.

Source: https://en.wiktionary.org/wiki/backshift