Medical Definition of lose
lost \ˈlȯst\play ; losing
1: to become deprived of or lacking in <lose consciousness> <lost her sense of smell>; also : to part with in an unforeseen or accidental manner <lose a leg in an auto crash>
2a: to suffer deprivation through the death or removal of or final separation from (a person) <lost a son in the war>b: to fail to keep (a patient) from dying <have lost many fewer pneumonia cases since penicillin came into use>
3: to fail to keep, sustain, or maintain <lose one's balance>
4: to free oneself from : get rid of <dieting to lose weight>
Seen and Heard
What made you want to look up lose? Please tell us where you read or heard it (including the quote, if possible).