addicted, absorbed in
耽 centers on being deeply engrossed in something, often to an excessive degree: addicted, absorbed, or indulging in an activity.
耽 combines 耳 (ear) with 冘, which likely contributes the sound. The original sense may relate to listening intently or being absorbed in something heard, but the exact historical development is uncertain.
The ear 耳 on the left suggests listening, and the right side 冘 looks like a person leaning in. Imagine someone so absorbed in what they hear that they become addicted to it.
For タン, picture a person so addicted to tanning under the sun that they ignore everything else: tan -> タン, and they are completely absorbed in getting a tan.
aestheticism; pursuit of beauty; obsession with beautiful things
to indulge in; to give oneself up to; to be obsessed by
indulgence (in alcohol, women, etc.); debauchery; dissipation
indulging in pleasure; giving oneself up to enjoyment
a fast (dissolute) life; a life of follies; a life given to dissolute pleasures
aestheticism
aesthetic school
aesthetic; esthetic
absorption in reading