Open English Wordnet

(n)sleeper, slumberera rester who is sleeping

(n)sleepera spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal

(n)sleeperan unexpected achiever of success“the winner was a true sleeper — no one expected him to get it”

(n)tie, railroad tie, crosstie, sleeperone of the cross braces that support the rails on a railway track“the British call a railroad tie a sleeper”

(n)sleeping car, sleeper, wagon-lita passenger car that has berths for sleeping

(n)sleeperpajamas with feet; worn by children

(n)sleepera piece of furniture that can be opened up into a bed

(n)sleeper, sleeper gobytropical fish that resembles a goby and rests quietly on the bottom in shallow water

(n)sleeperan unexpected hit“that movie was the sleeper of the summer”

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