The Collaborative International Dictionary
                    To inform against
                    
                        
                
                                                                    Inform \In*form"\, v. t.
- 
To take form; to become visible or manifest; to appear.
It is the bloody business which informs Thus to mine eyes.
--Shak. - 
To give intelligence or information; to tell.
--Shak.He might either teach in the same manner, or inform how he had been taught.
--Monthly Rev.To inform against, to communicate facts by way of accusation against; to denounce; as, two persons came to the magistrate, and informed against A.
 
Usage examples of "to inform against".
Hildebrand, I do hope to goodness he doesn't still wish to inform against you?
I should warn you that she is ready to inform against you to the nearest magistrate, Lucy.