masquerade as someone/something
phrasal verb with masquerade verb uk/ˌmæs.kərˈeɪd/ us/ˌmæs.kəˈreɪd/
假冒;假扮
to pretend or appear to be someone or something
Hooligans masquerading as protesters have once again caused disturbances. 假扮成抗议人士的流氓恶棍再次闹事。