Girl (Dates to the 1300s)
Today’s meaning: young female.
Original meaning: young person, either gender.
Fantastic (Dates to the 1300s)
Today’s meaning: exceptionally good.
Original meaning: existing only in the imagination, like a fantasy.
Buxom (Dates to the 1100s)
Today’s meaning: large-breasted.
Original meaning: compliant or obedient. John Milton used it this way in Paradise Lost; he describes Death flying easily through “the buxom air.”