漏斗

1. Origins, structure, and basic meaning

• Structure: 漏斗(ろうと) means a funnel, which guides material such as liquid from a wide opening through a narrow outlet.
• Basic usage: It names a tool for transferring contents into containers with narrow openings, such as bottles.

2. Common pitfalls and similar expressions

• The tool and the destination
  • In 漏斗を使って瓶に移す, 漏斗を使って identifies the tool and 瓶に identifies the receiving container.
• Substitution with 代わりにする
  • 厚紙を漏斗の代わりにする means using heavy paper instead of a funnel. The paper before を is the substitute; the funnel before の代わりに is the tool being replaced.