What does the saying "even a broken clock is right two times a day" mean?

Though improbable, a bad guess or action is sometimes correct

Timing is everything and you just have to be patient

If someone were to say "well that was close" in regards to almost achieving an intended goal, what sarcastic response is sometimes used?

"only good in horseshoes and hand grenades"

What does the old saying "that's the bees knees" mean?

What does the saying "you can lead a horse to water, but you can't make him drink" mean?

No matter your best intentions, a guiding hand can't force someone to help themselves

It's time to put down the horse and sell the remains to a glue factory

What does the saying "behind the eight ball" mean?

The end of an event, activity, era, etc  is coming.