Definition Of lost
(of a game or contest) in which a defeat has been sustained.
the lost election of 1994
be deprived of or cease to have or retain (something).
I've lost my appetite
become unable to find (something or someone).
I've lost the car keys
denoting something that has been taken away or cannot be recovered.
if only one could recapture one's lost youth!
earn less (money) than one is spending or has spent.
the paper is losing $500,000 a month
Example Of lost
A fifth member turned up late, saying he got lost sightseeing, but the other four have not been seen.
Abraham, who got lost traveling to the city, was also a bit erratic with his driving on the course.
All now turned on the outcome of John's attempt to recover his lost lands.
And in total I've probably spent more than a year looking for lost car keys.
Any nervousness quickly dissolved as we catch up on lost years.