act as Synonym: serve as Meaning to perform the same function as a particular person or thing For example act as something I cant make it to the meeting Bob, so would you mind acting as chairman today? act as something The kidneys act as filters to keep the blood clean. ━━━━━━━━━━━ #Phrasal_Verb_of_the_Day @EnglishoftheDay @QuizoftheDay 3.0K views03:30