揺り籠

1. Origins, structure, and basic meaning

• Structure: 揺り籠 (ゆりかご) is a noun for a small bed designed to cradle and rock a baby.
• Basic usage: 揺り籠で眠る makes the cradle the baby’s sleeping place, while 揺り籠を作る makes it the object a grandfather builds for the family.

2. Common pitfalls and similar expressions

• Place of use and object made
  • 揺り籠で marks where sleep occurs, whereas 揺り籠を marks the object of construction. Neither construction says the baby builds the cradle or the cradle creates the baby.