升

1. Origins, structure, and basic meaning

• Structure: The spelling is 升, read as ます. It is a noun for a traditional square wooden vessel used to measure grain or liquid and also used as a cup for serving sake.
• Basic usage: Measuring rice with a wooden measure appears in 木の升で米を量る, while pouring sake into a square wooden cup appears in 升に酒を注ぐ.

2. Common pitfalls and similar expressions

• Difference from 計量カップ
  • Unlike a modern graduated measuring cup, it is a traditional square wooden vessel made to hold a set amount.