盗む

1. Origins, structure, and basic meaning

• Structure: 盗む (ぬすむ) is a transitive verb meaning to steal another person's property.
• Basic usage: 商品を盗んではいけない prohibits theft; 城から鍵を盗んだ reports stealing a key from a castle.

2. Common pitfalls and similar expressions

• Prohibition and completed theft
  • The stolen item takes を and its source から. てはいけない marks a prohibition, not merely a negative fact.