presoaking

/P R EH1 S OW1 K IH0 NG/
verb
  1. 1

    To soak in advance.

    โ€œto presoak lentils before cookingโ€

  2. 2

    To soak laundry in cold water prior to washing, sometimes with the addition of a biological or other preparation.

Source: https://en.wiktionary.org/wiki/presoak, https://en.wiktionary.org/wiki/presoaking