A person needs to lose weight.
Do what ever you want to do.
It's a boating phrase. Overboard means to go over the board, which is part of the boat. If you go overboard on a boat, you fall out into the water. As an idiom, it has come to mean doing so much that it seems excessive.
Remain confident, do not worry, things will go better tomorrow.
This is not an idiom. It means just what it says. It is a saying that means time seems to go by more quickly when you are doing something enjoyable than it does when you are uncomfortable.
It means to go out into the world and experience life on your own without being tied to your mother's apron strings.
Do what ever you want to do.
it means go to sleep
It means to go faster
it means to take a chance or risk
This is not an idiom. An idiom is an expression whose meaning cannot be deduced from its elements. To go through fire and water for someone is easily understood to mean to make a special effort and to undergo difficulties for that person's sake.
It means that there is not enough for everyone. It's insufficient.
It means that someone is totally surprised. They have no idea what to do or where to go, the are standing there.
"Have at it" means "give it a try". Another similar colloquialism or idiom would be, "Go ahead, knock yourself out", or "Go for it".
your fat and you need to go on a diet that's the definition.
It's a boating phrase. Overboard means to go over the board, which is part of the boat. If you go overboard on a boat, you fall out into the water. As an idiom, it has come to mean doing so much that it seems excessive.
It means to feel that there is no way to go on and you just want to give up.
When you draw the line, you set out limits of what you find acceptable, beyond which you will not go.