English to English

verb (v)

• act as a substitute(verb.social)

  Synonym:
  deputise, step in, substitute
  

  source: wordnet30
• appoint as a substitute(verb.social)

  Synonym:
  depute, deputise
  

  source: wordnet30
• To appoint as one's deputy; to empower to act in one's stead; to depute.(verb)

  source: webster1913