The Collaborative International Dictionary of English v.0.48:
higher-up \high"er-up"\, n. A superior officer or official; a person having greater rank or station or quality than others; -- used chiefly in pl. [Slang] Syn: superior, superordinate. [Webster 1913 Suppl. + WordNet 1.5]WordNet (r) 3.0 (2006):
higher-up n 1: one of greater rank or station or quality [syn: superior, higher-up, superordinate] [ant: inferior]