Definition of bed-warmer in English:
bed-warmer
noun
A device for warming a bed, typically a metal pan filled with warm coals.
暖床炉（尤指暖床用炭火盆）- Part of the hotel's hospitality included a maid who came to warm the guest's bed with a bed-warmer.
- ‘Maybe he finally wants a bed-warmer,’ blankly stated one of the four kitchen hands, James.
- There was a bed too, with soft white sheets, and a willing maid with a copper bed-warmer full of hot coals.