Reference meaning
sleeper
Last updated
a rester who is sleeping
Related source terms
slumberer
Other meanings
2. noun
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
3. noun
an unexpected achiever of success
4. noun
one of the cross braces that support the rails on a railway track
Source and scope
This definition is reproduced from Princeton WordNet 3.0, sense 10610465-n, under the WordNet 3.0 License. It has not yet received VocabularyBase editorial review. Read the source and license details.