ichidan verb
water down; dilute with water
Used for adding water to a liquid to reduce its strength, flavor, or concentration.
ジュースが濃すぎるので、水で薄めてください。
The juice is too strong, so please water it down.
彼はウイスキーを水で薄めて飲むのが好きだ。
He likes to drink whiskey diluted with water.