It means you are at the peak, the highest point you are going to get. You usually see this in a business sense, as in someone is "on top" of other businesses or people.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
This is not an idiom. "It's over" means that it is over, or finished, or done. Whatever "it" refers to has concluded.
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.
The head person.
The highest amount paid for
It's not an idiom. It means just what it says -- something is on the crest of a wave. The crest is the top of the wave.
No. It means exactly what it seems to mean - some classes were ranked at the top.
It means that you feel euphoric and totally optimistic.
Nothing. I believe you misspelled WORLD - "on top of the world" means that everything is going well for you and you feel great.
reach the top
This is not an idiom. The verb "lay" is the past tense of "lie," and means that whatever or whoever the subject of the sentence may be, they were laying down on top of some hay.
It's kind of like "blew his top", which means that he/someone had an outburst of anger.
That means answering with the first thought(s) that come(s) to mind.
No, "blew his top" is considered an idiom.
It's not really an idiom. It means "what are you thinking about."