chicken - definition and synonyms

verb 

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/ˈtʃɪkɪn/

phrasal verb

chicken out

[intransitive]
present tense
I/you/we/theychicken out
he/she/itchickens out
present participlechickening out
past tensechickened out
past participlechickened out
informal
to not do something you were going to do because you are too frightened

I was going to tell her how much it really cost, but I chickened out.