Used when someone prefers not to challenge or upset the status quo to avoid conflict. She didn't report the mistake because she doesn't like to make waves.
Pro Tip 2/3
Subtle Disruption
Indicates a minor but intentional disturbance within a group or process. He's making waves by questioning the established procedure.
Pro Tip 3/3
Whistleblowing
Can imply exposing wrongdoing in an organization, which may cause disruption. Going to the press was her way of making waves to expose corruption.