De or het monsteroverwinning?

The correct Dutch article is:

de monsteroverwinning

Rule Words ending in -ing: almost always de. See the rule

How to use monsteroverwinning

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this monsteroverwinningdeze monsteroverwinning
that monsteroverwinningdie monsteroverwinning
our monsteroverwinningonze monsteroverwinning
your monsteroverwinningjouw monsteroverwinning
every monsteroverwinningelke monsteroverwinning
which monsteroverwinning?welke monsteroverwinning?
a big monsteroverwinning / the big monsteroverwinningeen grote monsteroverwinning, de grote monsteroverwinning