underplaying

/AH1 N D ER0 P L EY1 IH0 NG/
verb
  1. 1

    To play in a subordinate, or in an inferior manner; to underact a part.

  2. 2

    To make something seem less important than it really is.

  3. 3

    To play a low card when holding a high one, in the hope of a future advantage.

Source: https://en.wiktionary.org/wiki/underplay, https://en.wiktionary.org/wiki/underplaying