It's not really an idiom. It means just what it sounds like -- whatever happened just proves what you were saying all along.
You can't show me anything that I haven't seen already.?
This isn't a question -- nor are idioms questions, so you can't "answer" an idiom. Perhaps you mean "Soccer games aren't my cup of tea" instead -- here's a link to show you what that idiom means.
No, pics can not be shown.
"Having a heart" means to show compassion. It can also mean to show mercy, generosity, or forgiveness. Example: "Show us you have a heart and donate to our animal rescue organization!"
It means "do you understand" in an aggressive and standoffish manner. As in "If you show your face here ever again, you will cease to exist... you dig it!"
The idiom "crocodile tears" refers to insincere or fake displays of sadness or emotion. It comes from the myth that crocodiles shed tears while eating their prey, appearing to show remorse when in reality they are not genuine.
You were anxious to get revenge and show the bragging, overly-talkative person the correct way to do things.
It's not an idiom because you can figure out the meaning. Roosters crow to show the other chicken's who's the boss, so crowing means you're proud of yourself. Something worth crowing about would be something you deserve to be proud about.
Depending on the tone of voice you use, "Knock yourself out" is an idiom that could mean "Go ahead", or "Show me" or "I don't really care what you do".
it just goes to show that evolution can go wrong.
"Having a heart" means to show compassion. It can also mean to show mercy, generosity, or forgiveness. Example: "Show us you have a heart and donate to our animal rescue organization!"
It means that the war has a basis in law, it is a reasonable action, it can be justified. Which just goes to show that lawyers will do anything to make a living ! It has been said warfare is the ultimate failure of Diplomacy.