To "back" a horse means to bet on it. If you back the wrong horse, you're betting on a loser. In business, this often means that you have sided with the wrong person.
The idiom "on the wrong side of fifty" means being past the age of fifty, implying that the person is older or past their prime in some way. It can suggest that the person is no longer considered young or in their most desirable age range.
Inside out means turned wrong way outwards, or turned so that the inside is now facing out and vice versa.
It is a childish rhyme that you say when something has gone wrong instead of just saying "oops."
that means that you came to your senses and came to repentance after you realize that all you did was wrong.
When one makes a proclamation or statement as a true fact, and it is later proved to be wrong, they are said to "eat their words" - they have been humbled by their error.
"Bear in mind" just means to keep something in your mind. You could say "bear in mind that this answer might be wrong," or "bear in mind that the weather might change."
Putting the cart before the horse means doing things in the wrong order.
I think you heard it wrong. There is an idiom OPEN AND SHUT, which means something is over and done quickly, as if you opened the book, read the law, and shut the book quickly again.
No, there is nothing wrong with owning a horse.
20p that is wrong because it is not an expression
my mom says that's wrong!
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