vt, lost  los*ing  1  :  to suffer deprivation of  :  part with esp. in an unforeseen or accidental manner < a leg in an auto crash>   2 a  :  to suffer deprivation through the death or removal of or final separation from (a person) <losta son in the war>   b  :  to fail to keep (a patient) from dying <have lost many fewer pneumonia cases since penicillin came into use>  .
 
 
 
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