This is not an idiom. "It's over" means that it is over, or finished, or done. Whatever "it" refers to has concluded.
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This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
Nothing. The correct idiom is "ace in the hole," which literally means that you have an ace card (the highest value in the deck) hidden away somewhere so you can win the card game. It's come to mean any situation where you have a hidden advantage or something you can "pull out" to win the situation.
"Bring some objectivity into the matter under discussion", don't just rely on subjective factors.
Something that has easily been or will easily be achieved. It can mean something is way ahead of something and will complete a task long before others, or has already done so.
It means you feel great, you feel like you're worth a million bucks