飯

1. Origins, structure, and basic meaning

• Structure: 飯, read めし, is a single noun extending from cooked rice to a whole meal in casual use.
• Basic usage: It is a casual and somewhat rough term for cooked rice or a meal, as in 飯を食べる.

2. Common pitfalls and similar expressions

• Tone and register
  • In polite settings ご飯 or 食事 may be more natural, so consider the speaker and situation.