pass (yourself) off as (someone)

to pretend that you are someone else.

Maurice is trying to pass himself off as a journalist to get admitted to the press conference.

• not hold water
• not hold your breath
• not hold your liquor
• not hurt a fly
• not if can help it
• not if you can help it
• not in a month of Sundays
• not in my wildest dreams
• not in the business of
• not in the business of doing something
• not in the least
• not in the same league
• not in the slightest
• not judge a book by its cover
• not know beans about
• not know beans about something
• not know from Adam
• not know if are coming or going
• not know if you are coming or going
• not know someone from Adam
• not know the first thing about
• not know the first thing about something
• not know the half of it
• not know the meaning of the word
• not know what hit