High Bit: [from `high-order Bit'] N. 1. The Most Significant Bit In A Byte.

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:high bit: [from `high-order bit'] n. 1. The most significant
bit in a byte. 2. By extension, the most significant part of
something other than a data byte: "Spare me the whole {saga},
just give me the high bit." See also {meta bit}, {hobbit},
{dread high-bit disease}, and compare the mainstream slang
`bottom line'.
-- The AI Hackers Dictionary