have a good command of (something)(redirected from has a good command of)
have a good command of (something)
To be knowledgeable about or skilled in a particular area or thing. If you don't have a good command of the course material, then you won't do well on the exam.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have a good command of something
to know something well. Bill has a good command of French. Jane has a good command of economic theory.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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 Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.