Entry Word: betray

Function: verb

Meaning: 1 to be unfaithful or disloyal to <childhood friends of movie stars often betray them by telling their secrets to the supermarket tabloids>

Synonyms cross, double-cross, sell (out)

Related Words give away; inform (on), rat (on), snitch (on), split (on) [British], tell (on)

Phrases go back on

Near Antonyms defend, guard, protect, safeguard, save, shield

2 to make known (something abstract) through outward signs <his face betrayed his exasperation with his nosy neighbor> — see show 2