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Also, worth its weight in gold. Very valuable, as in John's been extremely helpful; he's worth his weight in gold, or That tractor's been worth its weight in gold. This metaphoric term dates from Roman times and appeared in English by the early 1300s.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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