a system, particularly used in the EU, whereby the blue-collar workers and the white-collar workers in an organization have similar status and any former differences in terms and conditions of employment are levelled up
to make or become harmonious
(transitive) (music) to provide a harmony for (a melody, tune, etc)
(intransitive) to sing in harmony, as with other singers
late 15c., "play or sing in harmony," from French harmoniser (15c.), from Old French harmonie (see harmony). Meaning "be in harmony" is from 1620s; that of "bring into agreement" is from 1727. Related: Harmonized; harmonizing.