If you deputize for someone, you do something on their behalf, for example attend a meeting.
例句
I sometimes had to deputise for him in the kitchen...有時候我不得不代替他下廚。Herr Schulmann cannot be here to welcome you and has asked me to deputize.赫爾·舒爾曼無法親自來迎接您，所以特請我作為代表。
英漢詞典釋義
vi.
擔任代表
I deputized for the manager when she was ill.經理生病時由我代她執行職務。
英英詞典釋義
Verb
1. act as a substitute;
"She stood in for the soprano who suffered from a cold"