angel's advocate
One who looks for and argues in support of the positive aspects and benefits of a certain argument, whether or not he or she believes them to be true. it is the opposite of a "devil's advocate," who argues against something for the sake of argument, not due to a personal opinion. I know a lot of people oppose the building of a new railway, but let me play angel's advocate for a second and tell you about all the ways it will improve our city!
enough to make the angels weep
So terrible, distressing, or grievous as to shake the foundations of one's faith or hope. The tragedy of those two young boys' deaths is enough to make the angels weep.
guardian angel
1. An angel or other supernatural being who is appointed to protect, guide, or otherwise watch over a particular individual. You're lucky to be alive after that accident! You must have a guardian angel!
2. A person who protects, guides, or otherwise looks after the welfare of someone. Uncle John became my guardian angel after my parents died, always making sure I had everything I needed.
you're an angel
You are sweet and or/perfect. You can do no wrong. You brought me coffee? Ah, you're an angel. Right, like you stole the mascot. You're an angel, and you were at the library when it happened!
fallen angel
1. An angel who has rebelled against God and has been subsequently cast out of heaven. The Bible describes Lucifer as having become a fallen angel after he desired to become God rather than be a servant of God.
2. In finance, a stock or bond that has drastically declined in value. Try to avoid investing in fallen angels—they may have been highly priced once, but they will never return to their original value.
3. A company or organization that was previously successful but is currently failing. The high school's debate team was this year's fallen angel, losing all of their competitions after being dominant last year.
oil of angels
Money, particularly when used as a bribe. "Angel" was formerly a term for a type of coin. I think we'll be seated soon—I gave the hostess some oil of angels. Oil of angels is the only thing that's going to save you from some goons breaking your kneecaps.
be on the side of the angels
To behave in a kind or charitable way, or to support such actions. With war tearing apart the country, being on the side of the angels can cost you your life.
fools rush in where angels fear to tread
Ignorant or inexperienced individuals get involved in situations that wiser persons would avoid, as in I've never heard this symphony and here I am conducting it-oh well, fools rush in where angels fear to tread , or He tried to mediate their unending argument-fools rush in. This expression, so well known it is sometimes shortened as in the second example, is a quotation from Alexander Pope's Essay on Criticism (1709): "No place so sacred from such fops is barr'd ... Nay, fly to altars; there they'll talk you dead; For fools rush in where angels fear to tread."
on the side of the angels
Supporting the good side, as in Whatever you may think of him, on important issues he's usually on the side of the angels . This expression was coined by Benjamin Disraeli in 1864 in a speech about Darwin's theory that man is descended from apes: "The question is this: Is man an ape or an angel? Now I am on the side of the angels." Before long it was extended to broader use, specifically to the moral view.