A more thorough explanation:

Definition: To invent, forge, or devise falsely.

Example: He fabricated a story about being sick to get out of work.

The example illustrates that fabricating involves creating a false story or situation. In this case, the person invented a story about being sick to avoid going to work.

Example: The police were accused of fabricating evidence to secure a conviction.

This example shows that fabricating can also involve creating false evidence to support a particular outcome or agenda. In this case, the police were accused of inventing evidence to secure a conviction.