inform on/against

phrase

: to give information about the secret or criminal activity of (someone) to the police

Despite pressure from the police he refused to inform on the other conspirators.

Examples of inform on/against in a Sentence

Recent Examples on the Web

And another would be assigned to inform on me, as the instructor. — Anne Applebaum, The Atlantic, 23 Jan. 2026

Christian gatherings must be completely secret; a neighbor could inform on you with devastating results. — Alex Nitzberg, FOXNews.com, 14 Jan. 2026

The law offered Ohioans a cash incentive to inform on their neighbors by alerting local authorities whenever a white employer hired Black workers who had not registered or did not have proof of freedom. — Equal Justice Initiative, USA Today, 6 Nov. 2025

The documents included disciplinary information and reportedly showed that Sherrill was barred from walking at her 1994 graduation after refusing to inform on classmates involved in a cheating scandal. — Martha McHardy, MSNBC Newsweek, 25 Oct. 2025