From Middle French casque.

• (RP) IPA: /kɑːsk/
• (America) IPA: /kæsk/

cask (plural casks)

1. A large barrel for the storage of liquid, especially of alcoholic drinks. (See a diagram of cask sizes.)

   Hyponyms: tun (1), pipe (½), butt (½), puncheon (⅓), tertian (⅓), hogshead (¼), tierce (⅙), barrel (⅛), rundlet (⅟₁₄)

2. (obsolete) A casket; a small box for jewels.
   • 1591 (date written), William Shakespeare, “The Second Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies. […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act III, scene ii], line 409:

     A jewel, locked into the woefullest cask / That ever did contain a thing of worth.

3. (archaic, slang) A brougham or other private carriage.
4. Obsolete form of casque

• French: tonneau, fût, barrique
• German: Fass, Faß, Tonne
• Italian: botte
• Portuguese: barril, casco
• Russian: бо́чка
• Spanish: cuba, tonel

cask (casks, present participle casking; simple past and past participle casked)

1. To put into a cask.

• quash