Make small, fine adjustments or pinches to something to improve or fine-tune it.
From Old English 'twaccian' meaning to pull or pinch, which combined with Middle English dialect 'tweak.' The word stayed relatively unchanged for centuries, maintaining the sense of small precise movements.
Engineers and programmers use 'tweaks' constantly—it's the difference between major overhauls and the tiny adjustments that make something perfect. Silicon Valley culture is basically built on the philosophy of constant small tweaks rather than redesigns.
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