1. a rester who is sleeping

Similar word(s): slumberer

Definition categories: person, rester

2. a spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal

Definition categories: person, diversionist, saboteur, wrecker, spy, terrorist

3. an unexpected achiever of success

- the winner was a true sleeper--no one expected him to get it

Definition categories: person, achiever, succeeder, success, winner

4. one of the cross braces that support the rails on a railway track

- the British call a railroad tie a sleeper

Similar word(s): crosstie, tie

Definition categories: man–made, brace, bracing

5. a passenger car that has berths for sleeping

Definition categories: man–made, carriage, coach

6. pajamas with feet; worn by children

Definition categories: man–made, jammies, pajama, pyjama

7. a piece of furniture that can be opened up into a bed

Definition categories: man–made, furniture

8. tropical fish that resembles a goby and rests quietly on the bottom in shallow water

Definition categories: animal, percoid

9. an unexpected hit

- that movie was the sleeper of the summer

Definition categories: act, bang, hit, smash, smasher, strike

Sentences with sleeper as a noun:

- I'm a light sleeper: I get woken up by the smallest of sounds.

- She's a heavy sleeper: it takes a lot to wake her up.

- We spent a night on an uncomfortable sleeper between Athens and Vienna.

- A box-office bomb when it first came out, the film was a sleeper, becoming much more popular decades after being released.

- Aaron, Devin, and Laura looked so comfy in their sleepers.