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Keep something a secret. There are four origins of this idiom (I GUARANTEE IT): - English archers protected their bows by putting the strings on their heads under their helmets; - “keep it under our hat” was mentioned in 1982 in periodical "Gleanings in Bee Culture"; - President Abraham Lincoln's stove pipe hat, where he kept important papers; - the ceremonial swordbearer of the Lord Mayor of London (can be dated to 1420), who keeps the key to the Lord Mayor’s seal of office in a special pocket in his hat.
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