Weak: Vt. 1. To Change Slightly, Usually In Reference To A Value.

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:tweak: vt. 1. To change slightly, usually in reference to a
value. Also used synonymously with {twiddle}. If a program is
almost correct, rather than figure out the precise problem you
might just keep tweaking it until it works. See {frobnicate}
and {fudge factor}; also see {shotgun debugging}. 2. To
{tune} or {bum} a program; preferred usage in the U.K.
-- The AI Hackers Dictionary