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In this post, you're going to learn the idioms based on colours.  B lue-collar    r elating to people  who do  physical work in a factory , mine, etc.: The city is facing a shortage of blue-collar workers such as plumbers and electricians.   White-collar   r elating to jobs that are done in an office, bank, etc.: The company will cut 1.400 white-collar jobs.     I n black and white   i n a written or printed form:   I want to put it in black  and white .   Out of the blue   u nexpectedly:   His resignation came out of the blue .   Point the town red   t o have a good time by going to a lot of bars or clubs:   Let's paint the town red .   Like a red rag to a bull   American  English: like waving a red flag in front of a bull   s omething that will make someone angry or upset:   D...

An indefinite pronoun is a pronoun that does not refer to any particular person, thing or place.   The indefinite  pronouns   ending  in  –body, –one,  - thing and -where   are used  to refer  to people, things, and places  when you do not know who or what they are .   They are written as one word .   Note that no one is written as two separate words .

Here is a list of idioms using the names of countries, with meanings and examples