The spelling of the word "appeacher" is often a point of confusion among English speakers. The IPA phonetic transcription reveals why: /əˈpiːtʃə(r)/. This means that the first syllable is pronounced "uh" as in "up" while the second syllable is pronounced "eech" as in "beach". The last syllable is pronounced "er" as in "teacher". Remembering the correct pronunciation and spelling of "appeacher" can be tricky, but with practice, it becomes easier.
An accuser.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.