DEPUTIZE
depute, deputize, deputise
(verb) appoint as a substitute
substitute, deputize, deputise, step in
(verb) act as a substitute; “She stood in for the soprano who suffered from a cold”
Source: WordNet® 3.1
Etymology
Verb
deputize (third-person singular simple present deputizes, present participle deputizing, simple past and past participle deputized)
(transitive) To make (someone) a deputy; to officially empower.
(transitive) To make or name as a substitute.
(intransitive) To act as a deputy.
Source: Wiktionary
Dep"u*tize, v. t.
Definition: To appoint as one's deputy; to empower to act in one's stead;
to depute.
Source: Webster’s Unabridged Dictionary 1913 Edition