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]

Words nearby have a good command of

have a crack at, have a crush on, have a familiar ring, have a fit, 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