Definition of deep-six verb from the Oxford Advanced Learner's Dictionary

 

deep-six

 verb
verb
BrE
 
; NAmE
 
Verb Forms present simple I / you / we / they deep-six
BrE
 
; NAmE
 
he / she / it deep-sixes
BrE
 
; NAmE
 
past simple deep-sixed
BrE
 
; NAmE
 
past participle deep-sixed
BrE
 
; NAmE
 
-ing form deep-sixing
BrE
 
; NAmE
 
 
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[usually passive] deep-six something (North American English, informal) 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. Word Origin 1920s (as the deep six ‘the grave’): perhaps from the custom of burial at sea at a depth of six fathoms.
See the Oxford Advanced American Dictionary entry: deep-six