smell, fragrance, aroma
苾 centers on a pleasant, strong scent: a fragrant smell or aroma. The meaning covers both the sensation of smell and the quality of being fragrant.
苾 combines the grass radical 艹 with 必, which likely contributes the sound. The character is associated with fragrant plants or aromatic substances.
The grass radical 艹 on top of 必 suggests a plant that must be fragrant. Imagine a field of aromatic herbs where every blade of grass carries a strong, pleasant scent.
For ヒツ, picture a fragrant plant that hits you with its aroma as soon as you walk by: hits -> ヒツ, and the scent is unforgettable.
bhikkhu (fully ordained Buddhist monk)