Richard Harris: The came the final Christmas. I was about six. He came down with a bag and a white beard then he gave us out the presents and he handed me mine and I said, "t'ank you Santa Clause", and he put his hands around me and he kissed me. And I said, "that's my dad's special smell" and that's when I twigged. The most ridiculous thing in the world to twig that what I twigged; the scent of whiskey on his breath.
Johnny Carson: Boy, that's kind of sad. Santa comes down with a bag in the bag.
NBC. The Tonight Show. December 12, 1974.
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"And nobody ever will," ses the dark man, shaking his 'cad; "if they was all as fly as you, I might as well put the shutters up. How did you twig I was a detective officer, cap'n?"
W. W. Jacobs. Sailor's Knots
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'Not necessarily at once. It could be so managed. Twig?'
Arnold Bennett. The Grand Babylon Hôtel (1902)
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Why those plainclothes men are always courting slaveys. Easily twig a man used to uniform.