the.com/doorstop

means A weighted object—wedge, ball, or spring-hinged gadget—that holds a door open or keeps it from slamming shut.

from Straightforward compound: 'door' + 'stop,' emerging in English as doors themselves became common household features needing management. 'Stop' carries its old sense of 'something that halts or blocks motion,' the same sense you hear in 'stopgap' or a train's 'last stop.' No hidden story here — just carpentry-plain naming, the word doing exactly what the object does.