1) Act as a substitute 2) Appoint as a substitute 3) Appoint as an assistant 4) Deputise 5) Make a substitution 6) Replace 7) Step in 8) Substitute 9) Supersede 10) Supervene upon 11) Supplant 12) To act as a deputy 13) To make a deputy 14) To officially empower 1) Assign 2) Deputise 
• (v. t.) To appoint as one`s deputy; to empower to act in one`s stead; to depute.
Dep'u·tize (dĕp'u*tīz) transitive verb To appoint as one's deputy; to empower to act in one's stead; to depute. 
deputize 1. To appoint as a substitute. 2. To act as a substitute.
deputise verb appoint as a substitute