I am reading a book now, and one of the chapters opens itself by the following phrase, which its meaning makes me to feel lost in English... even after I've done a nice research on Google and dictionaries.
"mother, asked Kate, "Is it correct to say 'water a horse' when he is thirsty?"
"Yes, dear, quite correct"."
"Then I am going to milk the cat"
I think that I do understand what these idioms mean (to urinate, and getting pussy) but I don't understand them in the context at all.
For me, the question if it's "correct to say 'water a gorse' when he is thirsty" is not logical. The same thing regarding to the following comments there, there is not coherence. Therefore I would like to know the explanation for this paragraph.
and this is the full picture of the page in which these paragraph are found: