rat - definition and synonyms

verb 

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/ræt/
present tense
I/you/we/theyrat
he/she/itrats
present participleratting
past tenseratted
past participleratted

phrasal verb

rat on

[transitive]
present tense
I/you/we/theyrat on
he/she/itrats on
present participleratting on
past tenseratted on
past participleratted on
informal
  1. 1
    rat on someone to tell someone in authority about something that someone you know has done wrong
  2. 2
    rat on something British to not do something that you promised to do

    I can’t back someone who rats on his promises.