"to have something mastered" in Dutch

iets onder de knie hebben

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Literal Breakdown

English	Dutch	Learn
something	iets	Learn
under; among	onder	Learn
the	de	Learn
knee	knie	Learn
to have	hebben	Learn

Summary

The Dutch translation for “to have something mastered” is iets onder de knie hebben. The Dutch, iets onder de knie hebben, can be broken down into 5 parts:"something" (iets), "under; among" (onder), "the" (de), "knee" (knie) and "to have" (hebben).