To get back on the horse: Idiom. To try again when something you have done didn’t turn out well. E.g. “I see your bread got burnt in the oven… don’t let that disappoint you. Just get back on the horse and do it again. In terms of pronunciation, pay attention to the sound of “horse”: “Horse” ends with a short harsher «S», almost like a «Z» sound: /horz/ However, students of English may easily confuse “horse” with “whores”. “Whores” has a longer “o” and ends with a lon-ger “S”, with a very subtle “eh” sound before the “S”: /ho:r(e)s/

You can see this funny video on YouTube: OKA