the.com/traitor

means A person who betrays a cause, country, or trust placed in them, often by switching sides or exposing secrets to those who'd use them against you.

from From Old French 'traitor/traïtor', from Latin 'traditor' meaning 'one who hands over' — built from 'tradere', to deliver or surrender, which is also the ancestor of 'tradition' (literally, what's handed down). So a traitor and a tradition share a root: both involve handing something over. The word hardened in meaning during Latin's use for those who 'handed over' cities, secrets, or allies to an enemy — treachery framed as a dark kind of delivery service.