Definition of deep-six verb from the Oxford Advanced American Dictionary

 

deep-six

 verb
verb
 
[usually passive]deep-six something(informal)Verb Forms present simple I / you / we / they deep-six he / she / it deep-sixes past simple deep-sixed -ing form deep-sixing
 
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to decide not to do or use something that you had planned to do or use Plans to build a new mall were deep-sixed after protests from local residents.
See the Oxford Advanced Learner's Dictionary entry: deep-six