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dob sb in

UK informal phrasal verb with dob
 
/dɒb/
 
US  /dɑːb/ verb (-bb-)

Definition

to secretly tell someone in authority that someone else has done something wrong: Who was it who dobbed me in (to the teacher)?Revealing secrets and becoming known
(Definition of dob sb in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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