Final answer:
The English word derived from the Latin phrase 'to crowd together' is 'congregate', which is related to the term 'emergent norm theory' in crowd behavior.
Step-by-step explanation:
The word that comes from the Latin phrase 'to crowd together' is congregate. This word is derived from the Latin 'congregare', with 'con-' meaning 'together' and 'gregare' derived from 'grex', meaning 'flock' or 'herd'. Thus, to congregate means to come together or gather into a crowd or assembly. The concept of people crowding together is also discussed within the context of emergent norm theory, which examines the influence of social norms on crowd behavior.