Artificial intelligent assistant

crush hat

crush hat
  A soft hat which can be crushed flat; spec. a hat constructed with a spring so as to collapse and assume a flat shape; an opera-hat.

1838 Dickens Nich. Nick. xix, Folding his crush hat to lay his elbow on. 1848 Thackeray Bk. Snobs i. 1891 Punch 25 Apr. 201/2 Smart new boy in cloak-room has noted gentlemen shutting up their crush hats, and promptly flattens de Jones's best silk topper.

Oxford English Dictionary

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