say it: bi-TRAY
betray is a verb meaning "reveal unintentionally". It carries 6 recorded senses.
disappoint, prove undependable to; abandon, forsake
“His sense of smell failed him this time”
“His strength finally failed him”
“His children failed him in the crisis”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for betray come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.