1. [n]  a squeeze with the fingers
2. [v]  adjust finely; "fine-tune the engine"
3. [v]  pull or pull out sharply; "pluck the flowers off the bush"
4. [v]  pinch or squeeze sharply

1. \Tweak\, v. t. [OE. twikken, originally the same word as
   twicchen; cf. LG. twikken. See {Twitch}.]
   To pinch and pull with a sudden jerk and twist; to twitch;
   as, to tweak the nose. --Shak.
   

2. \Tweak\, n.
   1. A sharp pinch or jerk; a twist or twitch; as, a tweak of
      the nose. --Swift.
   2. Trouble; distress; tweag. [Obs.]
   3. A prostitute. [Obs.] --Brathwait.
   

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 UK.

[Jargon File]