合わせ酢

1. Origins, structure, and basic meaning

• Structure: 合わせ酢(あわせず) means vinegar blended with seasonings to adjust its flavor.
• Basic usage: It is used for seasoned vinegar mixed into rice or for describing its acidity.

2. Common pitfalls and similar expressions

• The sound change in 酢
  • The standalone word 酢(す) is read ず in this compound.
• What is added and what it goes into
  • In ご飯に合わせ酢を混ぜる, に marks the rice receiving the vinegar, and を marks the seasoned vinegar being added.