undersell

/AH1 N D ER0 S EH0 L/
verb
  1. 1

    To sell goods for a lower price than a competitor.

  2. 2

    To sell something for less than its value.

  3. 3

    To put forward an idea, or to market a new product, with insufficient enthusiasm.

Synonyms

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