The word "trombly" is spelled with a silent "b". The IPA phonetic transcription of this word is /ˈtrɒmbli/. The "tr" sound is pronounced as "t" and "r" separately, while the "o" sound is pronounced as "ah". The "m" sound is followed by a silent "b", and the "ly" ending is pronounced as "lee". The correct spelling of the word "trombly" is essential for clear communication in both spoken and written language.