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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]

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A THANKSGIVING SPELLING QUIZ TO FEED YOUR HISTORY KNOWHOW

Before you celebrate family and blessings this year, take this quiz to test your spelling knowledge of the history and important figures of the first Thanksgiving.
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Words nearby have a good command of

have a familiar ring, have a fit, have against, have-a-go, have a go at, have a good command of, have a good day, have a good head on one's shoulders, have a good mind to, have a good thing going, have a good time
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.