expression, i-adjective
strong alkaline taste; harsh taste
Describes food or drink with a pronounced bitter, astringent, or alkaline taste, often from tannins or lye.
この山菜はアクが強いので、よく茹でてから使います。
These wild vegetables have a strong alkaline taste, so we boil them well before using.
expression, i-adjective
Figurative use describing a person with a strong, sometimes difficult personality; often implies stubbornness or a distinctive character.
彼はアクが強いけど、仕事は確かだ。
He's a bit idiosyncratic, but his work is solid.