Peter Drucker called it "systematic and purposeful abandonment" -- the idea that you can't do everything at once and
Keep it under your hat
Meaning
Keep it secret.
Origin
On first hearing this seems a rather strange phrase. Why should people put anything under their hats and, even if they were to, why would that be associated with secrecy? The speculation is that putting an item under one's hat would be a way of hiding it. Such trickery is recorded, as in the collection of stories published as The Adventurer, 1793:
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