形容詞 blue-collar:

1. of or designating manual industrial work or workers
2. of those who work for wages especially manual or industrial laborers- G.B.Shaw
   同義詞：propertyless, wage-earning, working-class

blue-col.lar

adj.（形容詞）
Of or relating to wage earners, especially as a class, whose jobs are performed in work clothes and often involve manual labor.
藍領(lǐng)工人的：屬于或和工薪階層有關(guān)的，尤指其工作要求穿著工作服和從事體力勞動的階層

【引伸】
blue.-col.lar
n.（名詞）