The manager will deputize his assistant to attend the meeting next week on his behalf.

deputize 是由名词 deputy（代理人、副手）加上动词后缀 -ize 构成的动词，表示"委派某人作为代理人"或"代理某人的职责"。deputize his assistant 意思是"委派他的助手作为代理人"。