Here are some examples of "fling" used in a sentence:
- She flung her backpack onto the bed in frustration.
- The baseball player took a big swing and flung the ball far into the outfield.
- I flung open the windows to let in some fresh air.
So in summary, "fling" means to throw something with force or energy, often in an uncontrolled way. It implies more force than a gentle toss.