"Getting behind an idea" means to support or endorse that idea. It suggests that you are in favor of the concept and are willing to help it succeed.
It's not really an idiom - if something is at your heels, it's following close behind you. This means right behind you, almost upon you.
You can guarantee something.
flatter her to get something
Idiom
It depends on how you use it. If you mean literal colors, then it's not an idiom. If you say something like "It's all there in black and white," then it's an idiom meaning that something is printed.
This isn't an idiom - it's talking about some animal with their tail held high, flying behind them.
to want to do something; a wanting to entertain oneself
Nothing. Perhaps you're thinking of "eyes in the back of one's head," which means that the person is so alert and observant that it seems as though they have an extra set of eyes.
Eternal isn't an idiom. It's a word. Idioms are phrases that seem to mean one thing but mean something else.
It's not an idiom - it means a cup with some tea in it. NOT your cup of tea, however, is an idiom - it means that something is not to your liking or preference.
to make something stronger ,,