牛丼

1. Origins, structure, and basic meaning

• Structure: 牛丼 is read as ぎゅうどん and means a Japanese beef bowl, typically rice topped with seasoned cooked beef and onion.
• Basic usage: Use 牛丼を食べる for eating a beef bowl and 牛丼に卵を載せる for topping it with an egg.

2. Common pitfalls and similar expressions

• Difference between 牛丼 and 牛肉
  • The former names a complete rice-bowl dish, whereas the latter names beef itself as an ingredient.