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dob in /dɒb 'ɪn/  

(verb) (informal) Usage note: This term is used by many speakers.

To tell a person in authority (for example, a teacher) about something wrong that another person has done.

Example: Police Commissioner Andrew Scipione last month launched an appeal urging the public to dob in anyone possessing illegal firearms. (http://www.dailytelegraph.com.au/news/clubs-scan-for-weapons/story-e6freuy9-1225929390627)  

A woman dobbing in a colleague

(photo by DoctorKan)