Red-collar and blue collar

[Student]

Test No. incompl/advan-1 "Code of Practice", question 5

Job losses are mainly in the ......... sectors of the industry.

(a) blue-collar
(b) red-collar
(c) stiff-collar
(d) high-collar

Test No. incompl/advan-1 "Code of Practice", answer 5

Job losses are mainly in the blue-collar sectors of the industry.

Correct answer: (a) blue-collar

Hello Alan and Torsren! I don't now meaning of "red-collar" and "blue-collar".
Thank you

Student

[Torsten]

Hi Student,

As far as I know 'red collar' doesn't have any idiomatic meaning. An explanation of the idiom 'blue collar' can be found by clicking here:

What is blue-collar sector of the industry?
http://www.english-test.net/forum/ftopic79.html

TOEIC listening, photographs: A worker using equipment