Corporate speak: Quiet Complaining - not being a team player and doing what we want you to do without another word, in exactly the way we think we said it, and bad-mouthing your benevolent employer to anyone and everyone who can hear

Actual meaning: literally just saying true things that have happened to you at your job as a result of the working environment or coworkers.

Example: "My manager canceled our holiday pay, made us work an extra 147 hours on holidays, and fired the project lead without warning to quickly cut costs and secure their own bonus which left us unable to complete 38% of our projects due to incomplete information that is no longer accessible"