a blue-collar worker is someone who does physical work, often in a factory.

Blue collar workers in the factories and shipyards were demanding wage increases. (always before noun)

They are hoping the new factory will create many more blue collar jobs. (= jobs for blue collar workers)

• do someone the world of good
• do something by halves
• do something with eyes closed
• do something with one hand tied behind back
• do something with one hand tied behind your back
• do something with your eyes closed
• do stuff
• dote on
• dote on someone
• dote on something
• do the business
• do the dirty on
• do the dirty on someone
• do the dirty work
• do the honors
• do the honours
• do the job
• do the rounds
• do the running
• do the trick
• do the unthinkable
• do the world of good
• do things by halves
• do time
• dot i's and cross the t's