Angels are spiritual beings that some people believe are God's servants in heaven.

You can call someone you like very much an angel in order to show affection, especially when they have been kind to you or done you a favour.

If you describe someone as an angel, you mean that they seem to be very kind and good.

If you say that someone is on the side of the angels, you believe very strongly that what they are doing is right.

If you say that someone rushes in where angels fear to tread, you are criticizing them gently because they get themselves into dangerous or difficult situations without thinking carefully enough about what they are doing.