Here are examples of the word/phrase "truncating" used in a sentence and paraphrased in a sentence...
Truncating his accuracy with darkness won't guarantee his defeat.
Minimizing his accuracy with darkness won't guarantee his defeat.
The rain is gradually truncating the fire.
The rain is gradually minimizing the fire.
Having to move in sand is truncating my speed.
Having to move in sand is shortening my speed.
Other Examples...