heist (countable and uncountable, plural heists) A robbery or burglary , especially from an institution such as a bank or museum. quotations HEIST definition: 1. a crime in which valuable things are taken illegally and often violently from a place or person…. Learn more. ' heist ' - Complete English Word Reference Definitions of ' heist ' A heist is a robbery, especially one in which money, jewellery, or art is stolen. [journalism] [...] Definition of heist noun from the Oxford Advanced Learner's Dictionary. an act of stealing something valuable from a shop or bank synonym robbery. It’s a tense thriller about a diamond heist that goes badly wrong. Questions about grammar and vocabulary?