jealous, envious
妒 centers on a resentful, possessive feeling toward another's advantages or relationships: jealousy and envy.
妒 combines 女 (woman) with 户, which likely contributes the sound. The character expresses jealousy, often associated with women in traditional contexts.
A woman 女 beside a door 户, peering through and feeling jealous of what others have inside.
For ト, imagine a jealous person muttering "toe" as they compare themselves to others: toe -> ト, and the envy burns.