What does betray mean?
To betray is to violate the loyalty or confidence that another person has placed in you. Most commonly, this involves acting against someone's interests — revealing their secrets, siding with their enemies, or failing them at a critical moment. The word carries strong moral weight: a betrayal implies not merely harm but the abuse of trust, which is why it stings more deeply than ordinary wrongdoing. Betray also has a subtler, involuntary sense: something can betray a hidden truth without anyone intending it. A trembling voice may betray nervousness; a forged painting may betray itself through anachronistic pigment. Here the word simply means 'to reveal unintentionally.' Derived from Latin through Old French, 'betray' ultimately comes from 'tradere,' meaning to hand over — the same root that gives us 'traitor' and 'tradition.' This shared origin captures the word's essence: betrayal is the act of handing over someone or something entrusted to your care.
To be disloyal to someone by breaking their trust, revealing their secrets, or acting against their interests.
"Judas is remembered as the disciple who betrayed Jesus."
Often used with objects such as trust, confidence, country, or cause.
To unintentionally reveal or make evident something that was intended to be kept hidden.
"A faint smile betrayed his satisfaction."
Typically used of facial expressions, body language, or involuntary signs of emotion.
The word 'betray' shares its root with 'tradition' — both trace back to the Latin 'tradere', meaning 'to hand over'. A tradition is something handed down; a betrayal is something (or someone) handed over.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of betray
Betray entered Middle English from Anglo-Norman and Old French 'trair' (to betray), which derived from Latin 'tradere' — 'to hand over' or 'deliver up,' formed from 'trans-' (across) and 'dare' (to give). The same Latin root produced 'traditor' (one who hands over), giving English 'traitor' and 'treason,' while its sense of handing down through generations yielded 'tradition.' Thus betray, traitor, treason, trait, and tradition all descend from a single Latin verb about transferring something into another's hands.
Related word forms
How betray is actually used
Common in both formal and informal contexts. The second sense (unintentionally revealing) is frequently used with body language or emotions, e.g. 'his accent betrayed his origins.' Strongly negative connotation in the first sense.
Easily confused with betray
'Portray' means to depict or represent something, while 'betray' means to break trust or reveal a secret.