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Word of the Day Tuesday, June 9, 2026

sleeper

/ˈslipiːr/ noun · British & US
Valid in UKValid in US
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What does sleeper mean?

noun

A person or animal that sleeps, especially one that sleeps a lot. A device or mechanism that can be activated or triggered by a sleeper, such as a sleeper switch.

Example

"The couch became a sleeper for the family, converting into a bed at night."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for sleeper

Antonyms of sleeper

Rhymes with sleeper

Etymologically related