1. [sometimes g-] the secret police force of the German Nazi state, notorious for its terrorism, brutality, etc.
2. [also g-] any secret police
3. [also g-]; Slang any police force or other authority regarded variously as sinister, ruthless, brutal, etc.
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'Gestapo'< Ger Ge(heime) Sta(ats)po(lizei), secret state police