酸っぱい

1. Origins, structure, and basic meaning

• Structure: 酸っぱい is an i-adjective read すっぱい, describing a sour taste or a sour-smelling odor.
• Basic usage: Use みかんは酸っぱい for taste and 酸っぱい香りがする for a smell that suggests sourness.
  • このみかんは少し酸っぱい。 says that this mandarin is a little sour; 酸っぱい香りがしたので、牛乳を確認した。 explains that the milk was checked because it smelled sour.

2. Common pitfalls and similar expressions

• 少し酸っぱい
  • 少し lowers the stated degree of sourness.
• 酸っぱい香りがする
  • 酸っぱい can describe a perceived odor as well as a directly tasted flavor.
• ので
  • ので links the sour smell to the reason for checking the milk.