noun / verb / adjective
master
MAS-tur/ˈmæstər/
To gain effective command over something.
The master woodworker carefully carves a violin from wood.

Etymology
Latin magister combined leadership with teaching. The skilled-person sense connects these roles: a master craftsman was qualified both to teach apprentices and to carry on a trade independently.
In context
you are not more skilled in the mystery of the woods, seeing that I have had the teaching of you, and that no one in broad England is my master at the craft.
More examples
- With daily practice, she masters the difficult piano piece.
- He takes a deep breath to master his fear.
- The chef is a master of simple, flavorful cooking.
Forms
master · masters · mastered · mastering
mastery noun — Expert skill or command over something.
masterful adjective — Showing great skill or confident control.