betray

To betray is to be disloyal, to reveal secrets, or to reveal your location to an enemy.

(verb)

An example of betray is when you cheat on your spouse.
An example of betray is when you tell secrets and betray trust.
An example of betray is when you sneeze and your enemy is then able to find you.

See betray in Webster's New World College Dictionary

transitive verb

1. to help the enemy of (one's country, cause, etc.); be a traitor to
2. to deliver or expose to an enemy traitorously
to break faith with; fail to meet the hopes of: he betrayed my trust in him
to lead astray; deceive; specif., to seduce and then desert
to reveal unknowingly or against one's wishes: his face betrays his fear
to reveal or show signs of; indicate: the house betrays its age
to disclose (secret information, confidential plans, etc.)

Origin: ME bitraien < be-, intens. + traien, betray < OFr trair < L tradere, to hand over: see treason

Related Forms:

See betray in American Heritage Dictionary 4

transitive verb be·trayed, be·tray·ing, be·trays

a. To give aid or information to an enemy of; commit treason against: betray one's country.
b. To deliver into the hands of an enemy in violation of a trust or allegiance: betrayed Christ to the Romans.
To be false or disloyal to: betrayed their cause; betray one's better nature.
To divulge in a breach of confidence: betray a secret.
To make known unintentionally: Her hollow laugh betrayed her contempt for the idea.
To reveal against one's desire or will.
To lead astray; deceive. See Synonyms at deceive.