euphemize

 
(also euphemise)

verb

[with object]
  • refer to (something unpleasant or embarrassing) by means of a euphemism: the song uses a vocabulary of euphemized profanity and obscenity [no object]: the impulse to euphemize is causing the syllables to multiply

Origin:

mid 19th century: from Greek euphēmizein 'use auspicious words' (see euphemism)