Thiswordiscommonlyusedaswhitecollarworkeror a whitecollarjob.
Ontheotherhand, bluecollarrelatestomanuallaboradvertisinghasjustchasingcarsandclothesadvertisingactivityofproducingadvertisementspubliclypromoting a productorserviceinordertoconvincepeopletobuy a chasetopursuesomething.
Itcouldbesomethingphysical, forexample, a dogchasing a catorcouldbeusedin a figurativesense, forexample, chasing a dreamsowecanbuyshit.
Wedon't neednobuyshit.
Wedon't needshit.
Used a synonymofthingsorstuffusedtorefertosomethingwhenyoudonotneedtonameexactlywhatitissexample, Thekitchenis a mess.