The word "tomback" may be unfamiliar to many people, but the correct spelling is actually "tombac". The word is derived from the Arabic word "tunbak", which refers to a copper alloy often used for creating decorative items. The IPA phonetic transcription for "tombac" is /ˈtɒmbæk/, with the emphasis on the first syllable. The spelling "tomback" may have come about due to a mishearing or mispronunciation of the word, but it is important to use the correct spelling to avoid confusion.
There is no standard English word "tomback" in the dictionary. It is possible that "tomback" is a misspelling or a regional slang term. If you have any additional details or context about the word, I may be able to help further.