twig = suddenly realize something. With emphasis on sudden.
understand = means to know something in depth. It could be known for a long time.
September 28, 2012
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To 'understand' is the widely used norm throughout the various types of English, whereas 'twig' is a purely British and informal usage.
I hope this helps.
September 28, 2012
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In U.S. English, a "twig" is a small and slender tree branch, so it's interesting to see that it has this alternate meaning in British English.
September 28, 2012
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