rarify

/R EH1 R AH0 F AY0/
verb
  1. 1

    To make rare, thin, porous, or less dense

  2. 2

    To expand or enlarge without adding any new portion of matter to.

Synonyms

Antonyms

Source: https://en.wiktionary.org/wiki/rarefy, https://en.wiktionary.org/wiki/rarify