pocket flask (plural pocket flasks)

1. (dated) A flat#Adjective|flat metal container for alcoholic beverages, with a narrow#Adjective|narrow neck#Noun|neck suitable for use#Noun|use as a drink#Verb|drinking spout#Noun|spout, design#Verb|designed to fit#Verb|fit into a man#Noun|man's pocket#Noun|pocket and popular in the 19th and early 20th centuries.

   Synonyms: hip flask, hip-pocket flask

   • 1855 December – 1857 June​, Charles Dickens, “Fellow Travellers”, in Little Dorrit, London: Bradbury and Evans, […], published 1857, OCLC 83401042 ↗, book the second (Riches), page 334 ↗:

     The traveller had been at the pains of going a long way up stairs to his sleeping-room, to fetch his pocket-flask of brandy.