source: "Merriam-Webster's Vocabulary Builder" (Second Edition) P397
hypercritical
...
If your father asks what you think of his new experimental meatloaf and you say it needs a pinch of oregano, you're being constructive; if you say he should cut down on the sawdust next time, you're probably being hypercritical.
I recognize these words individually, but I fail to figure out the meaning of "cut down on the sawdust".
At first, I misunderstood that it meant "dice the meatloaf on the surface of sawdust" (while wondering whether a layer of sawdust really has a surface). That's why I couldn't get the meaning of the sentence.