bedwarmer
/ˈbɛdˌwɔrmər/
noun
- A person or thing that warms a bed, such as a hot water bottle, an electric blanket, or a pet that sleeps on the bed.
- The electric blanket is a modern bedwarmer that keeps you cozy all night.
- She used a hot water bottle as a bedwarmer before getting under the covers.
- My cat is the best bedwarmer on cold winter nights.
Synonyms