[n] the social class lowest in the social hierarchy [adj] occupying the lowest socioeconomic position in a society
blue-collar, low-class, non-U, proletarian, propertyless, upper-lower-class, wage-earning, working-class
middle-class, upper-class
bourgeoisie, cog, common people, common run, common sort, commonage, commonality, commonalty, commoners, commons, creature, flunky, follower, hoi polloi, inferior, junior, laborers, lightweight, linendrapers, lower classes, lower middle class, lower order