保温

1. Origins, structure, and basic meaning

• Structure: The spelling is 保温, read ほおん, and it combines 保, meaning maintain, with 温, meaning warmth or temperature.
• Basic usage: The basic sense of 保温 is retaining heat or keeping food, drink, or another item warm.

2. Common pitfalls and similar expressions

• Maintaining warmth rather than heating from cold
  • Both examples use the form 保温. The focus is on preserving the existing warmth of tea or food rather than initially heating something cold.
• An insulated bottle and a pot over low heat
  • 保温できる瓶に温かいお茶を入れました。 — I put warm tea in an insulated bottle.
  • 料理を出すまで鍋を弱火で保温します。 — Keep the pot warm over low heat until the dish is served.