noun

a person sent or authorized to represent others, in particular an elected representative sent to a conference.

representative,envoy,emissary,commissioner,agent,deputy,commissary,spokesperson,spokesman,spokeswoman,frontman,ambassador,plenipotentiary,messenger,go-between,proxy,nuncio,depute,legate

verb

entrust (a task or responsibility) to another person, typically one who is less senior than oneself.

she must delegate duties so as to free herself for more important tasks

assign,entrust,give,pass on,hand on/over,turn over,consign,devolve,depute,transfer