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Learner's definition of LOST  
past participle of lose
Learner's definition of LOST  
: unable to be found
— see also long-lost
: not knowing where you are or how to get to where you want to go : unable to find your way
: no longer held, owned, or possessed
   b  : no longer known
   c  : no longer available
: not won : not possible to win
   b  : not capable of succeeding
not used before a noun[more lost; most lost]  : lacking confidence and feeling unsure of what to do
   b  : very unhappy
not used before a noun  : so interested in something that you do not notice other things — often + in

get lost

: to go away : leave — used in speech as a rude or angry way to tell someone to go away
— see also 2lost 2 (above)

give someone up for lost

: to decide that someone cannot be helped or saved

he who hesitates is lost

— see hesitate

lost for words

chiefly British
: unable to think of anything to say

lost in the shuffle

— see 2shuffle

lost on

: not appreciated or understood by (someone)

no love lost, very little love lost

— see 1love
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