offer food and wine one's guests
醼 centers on the act of hosting and entertaining guests with food and drink, specifically offering wine and a meal as a gesture of hospitality.
醼 combines 酉 (wine vessel) with 燕, which likely contributes the sound and may relate to feasting or entertainment. The exact historical development is uncertain.
Picture a wine jar (酉) beside a swallow (燕) — imagine a banquet where swallows flit about as you pour wine for your guests, offering food and drink in a lively feast.
For エン, imagine the party ending with everyone satisfied: end -> エン, as you finish offering wine and food to your guests.