Wednesday
noun
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 water day of the week is where the water flows from. Think of Wednesday (hump day) as being like a big hill in the middle of your week. What originates in the hills and flows down from them? Water! That's why "water day" is Wednesday.
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. Just watch out for the ひ becoming a び like it did in the word 曜日.
水曜日にするべきことは、大きく分けて三つあります。
What we have to do on Wednesday can be roughly split up into three things.
水曜日までに終わらせます。
I'll get it done by Wednesday.
毎週水曜日、学校の後プールに行って泳いでいます。
Every Wednesday, I go to the pool after school and swim.