the.com/drop earring

means An earring style where a gem or ornament hangs below the earlobe on a hook, chain, or wire, swinging free instead of sitting flush against the ear.

from Straightforward compound etymology here — 'drop' meaning a hanging or pendant element (as in 'drop of water,' or the architectural 'drop'), joined to 'earring' itself, Old English 'eare' (ear) plus 'hring' (ring, loop of metal). The jewelry sense of 'drop' meaning a suspended ornament dates back centuries, used for pendants and earrings alike long before it became a specific style category — no hidden story, just a thing named for exactly what it does.