blow the whistle (on (someone/something))

to show to the public dangerous conditions or illegal activities.

I knew my company was polluting the water, but I was afraid I would lose my job if I blew the whistle on it.

Usage notes: usually something bad is shown in the hope of correcting it

• feather in your cap
• feather nest
• feather own nest
• feathers fly
• feather your nest
• feather your own nest
• fed up
• fed up with
• fed up with someone
• fed up with something
• feed a line
• feeding frenzy
• feed someone a line
• feed someone to the lions
• not have a bone in your body
• not have a care in the world
• not have a cat in hell's chance
• not have a chance in hell
• not have a clue
• not have a dog's chance
• not have a hope in hell
• not have a leg to stand on
• not have a minute to call own
• not have a minute to call your own
• not have a monopoly on