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2017 Word of the Year

have a good command of

Have the ability to use or control; have mastery of. For example, She has a remarkably good command of Japanese, or He had a good command of his emotions. [ Mid-1600s ]
The American HeritageĀ® Idioms Dictionary
Copyright Ā© 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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