Meanings
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1
adj
dated or dialectal: neat, trim, and smart in appearance
He arrived in a trig wool coat with every button fastened.
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2
noun
informal: trigonometry
She reviewed trig before the engineering entrance exam.
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3
adj
archaic: faithful, trustworthy, or secure
The old account praised him as a trig and dependable companion.
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Etymology
The adjective descends through Middle English trig or tryg from Old Norse tryggr, 'faithful, secure, or true,' a relative of English true. Its sense shifted from reliable or safe to trim and smart. The noun is a twentieth-century clipping of trigonometry.