reddening

/R EH1 D AH0 N IH0 NG/
verb
  1. 1

    To become red or redder.

  2. 2

    To make red or redder.

noun
  1. 1

    The action or effect of the verb to redden.

    โ€œThe cold weather caused some cheek reddening and some nose running.โ€

Source: https://en.wiktionary.org/wiki/redden, https://en.wiktionary.org/wiki/reddening