Made small adjustments or changes to improve something; pinched or twisted sharply.
From Old English 'twaccan' meaning to pluck or pinch. The word originally described a sharp physical action, then broadened to mean making slight adjustments or modifications.
Engineers and programmers love this word because it's less formal than 'modified' but suggests someone with real hands-on knowledge made the changes—you 'tweak' what you understand deeply, you 'modify' what you're just altering.
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