whiten

/หˆ(h)waษชtnฬฉ/

IPA: /W AY1 T AH0 N/

verb
  1. 1

    (To cause) to become white or whiter; to bleach or blanch.

    โ€œAge had whitened his hair.โ€

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