When a boss makes you leave your job, we say you are 'fired'. It usually means you did something wrong or the company does not need you anymore.
He was fired for being late.
She was fired from her old job.
To make a gun or weapon send out a bullet or other object quickly is to 'fire'. It means to push something out fast.
The soldier fired his gun once.
They fired arrows at the target.
To make a fire start burning is to 'fire' something. This can mean lighting wood or a stove to get heat or cook.
The campers fired the wood for heat.
He fired the stove to cook food.
In pottery or construction, 'fired' means to bake objects like clay in a very hot oven called a kiln so they become hard and useful.
The artist fired the clay pots carefully.
Bricks are fired to make them strong.
When someone is very excited or full of energy, we say they feel 'fired up'. It means they are ready to do something with a lot of power.
She felt fired up before the game.
He is fired and ready to start work.
When someone or something is attacked by bullets or gunfire, we say they were 'fired at' or have been 'fired upon'. It means bullets were shot at them.
The building was fired upon last night.
He was fired at during the battle.
To 'fire' can mean to start a machine or device by making it work, like a camera taking a picture or an engine starting to run.
The camera fired and took the photo.
The engine fired as soon as he turned the key.