1
lye
2
harsh taste;bitter taste;alkaline taste;astringency
4.煮え立たせる寸前で弱火にして、もう一度灰汁を取り除きます。
4. Just before bringing it to the boil, set to a low flame and remove the scum again.
3
scum (on a soup, broth etc.)
4
(excessive) self-assertiveness;strong individuality;strong idiosyncrasy
also written incorrectly as 悪
See also:
アクが強い (あくがつよい)