(idea) by Jargon Thu Jul 19 2001 at 10:15:25
HCF = H = heartbeat

heads down [Sun] adj.

Concentrating, usually so heavily and for so long that everything outside the focus area is missed. See also hack mode and larval stage, although this mode is hardly confined to fledgling hackers.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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