From Latin 'trādere' (to hand over), betrayal literally means the act of giving someone across to the enemy — sharing its root with the seemingly innocent word 'tradition.'
The act of breaking faith with or being disloyal to a person, cause, or trust
Betrayal derives from the Middle English 'bitraien,' itself from Old French 'traïr' (to betray), which descended from Latin 'trādere' meaning 'to hand over, deliver, surrender.' The Latin verb is a compound of 'trans-' (across) and 'dare' (to give), so the literal sense was 'to give across' or 'to hand over to another.' The semantic shift from neutral 'handing over' to negative 'treacherous delivery' occurred
The words 'betrayal' and 'tradition' share the same Latin root 'trādere' — both involve handing something over. One hands over trust to an enemy; the other hands over customs to the next generation. The divergence happened because 'traditio' in Church Latin could mean either the positive passing