懐中

1. Origins, structure, and basic meaning

• Structure: 懐中 (かいちゅう) is a noun for the space inside one's clothing or bosom.
• Basic usage: It appears with putting a valued object inside one's clothing or taking a small item out from there.
  • 旅人は大切な手紙を懐中に入れて出発した。 — The traveler placed the important letter inside their clothing and departed.
  • 男は懐中から小さな手帳を取り出した。 — The man took a small notebook from inside his jacket.

2. Common pitfalls and similar expressions

• Pocket and inside one's clothing
  • ポケット is a specific pocket, while 懐中 more broadly and formally means within one's clothing. Use に for putting something in and から for taking it out.