Definition of shadow-box verb from the Oxford Advanced Learner's Dictionary

 

shadow-box

 verb
verb
BrE
 
; NAmE
 
[intransitive]Verb Forms present simple I / you / we / they shadow-box
BrE
 
; NAmE
 
he / she / it shadow-boxes
BrE
 
; NAmE
 
past simple shadow-boxed
BrE
 
; NAmE
 
past participle shadow-boxed
BrE
 
; NAmE
 
-ing form shadow-boxing
BrE
 
; NAmE
 
 
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to box with an imaginary opponent, especially for physical exercise or in order to train