The correct spelling of the word "be trail" is actually "betrayal". The IPA phonetic transcription for the word is /bɪˈtreɪəl/. The word has two syllables, with primary stress on the second syllable. The "e" after the "t" in "betray" indicates that the vowel "a" in "betrayal" should be pronounced as a long "a", which is represented by the IPA symbol /eɪ/. This is an example of English spelling rules that can be challenging for non-native speakers to master.
The word "betray" has its origins in Old French. It comes from the word "betrayer", which means "to deceive", or "to deliver someone to an enemy by treachery or disloyalty". This Old French word was derived from the Latin word "tradere", which means "to hand over" or "to surrender". The word "tradere" is a combination of "trans", meaning "across" or "beyond", and "dere", meaning "to give" or "to hand". Over time, "betrayer" evolved into the word "betray", with the same meaning that we associate with it today.