I found the word "weamb" in this book. What does it mean? Womb? To see another sentence with this word, click "next" in the yellow area at the top of the page.
I've found this. So it's womb, but I still don't get the proverbs. What do they mean?
Yes, it says
A nag with a weamb and a mare with nean, i.e. none.
A nag is an old overworked horse, but if it has a womb, then it may be worth more than a mare that is sterile. It looks bad on the outside, but it's better inside.
(I'm guessing)