hot water bottle

US /ˌhɑːt ˈwɑː.t̬ɚ ˌbɑː.t̬əl/
UK /ˌhɑːt ˈwɑː.t̬ɚ ˌbɑː.t̬əl/
"hot water bottle" picture
1.

湯たんぽ

a rubber or plastic container filled with hot water and used for warmth, typically in bed

:
She put a hot water bottle at the foot of the bed to warm it up.
彼女はベッドの足元に湯たんぽを置いて温めた。
A hot water bottle can help soothe muscle aches.
湯たんぽは筋肉痛を和らげるのに役立つ。