This is a day of the week. You know this because it has 曜日 in it. But what day of the week is it? The earth day of the week is a day you find yourself close to the earth. Either you found you drank too much on Friday, so on this day's morning you're laying right on the ground of earth. Or, maybe you just want to sleep in after staying up late on Friday. Either way, this day you lay close to the earth is Saturday.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. It will help to know the word 曜日 as well.
I completely recovered from the fatigue from Saturday.
On Saturday, I truly realized that life is easy when you are a good-looking woman.
My stupid boss just told me that I have to work Saturday. Plus, I just caught a cold. And on top of that, my girlfriend dumped me. My life sucks.