Neat, smart, and well-dressed in appearance; also short for trigonometry in mathematics.
From Old Norse 'tryggr' meaning trustworthy or true, which evolved into Middle English meaning trim or neat. The modern sense emphasizes precision and order.
Trig is one of those words that shifted meanings dramatically—from 'reliable' to 'neatly ordered'—showing how precision and trustworthiness became linked in our minds. Today it's mostly used in math class, but sailors still use 'trig' to describe a well-maintained ship.
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