mercy

Mercy is the quality of kindness and forgiveness that stops you from harming or punishing somebody who you could harm or punish.

Example: The king would always prefer to show mercy, even to his enemies.

A mercy is a situation that it makes you feel lucky, usually because something worse didn't happen.

Example: It was a small mercy that the storm didn't last long.

A mercy mission or journey is one to help people who are in great need.

Example: They took food and set out on a mercy mission to find survivors.

If you are at the mercy of somebody or something, you have no control over your situation.

Example: I hope the trip will be nice, but we're at the mercy of the weather.

You use mercy or mercy me to show surprise.

Example: Mercy! You haven't come here alone, have you?