The word "onfalls" is a rare word that refers to the act of falling onto something. It is spelled with the prefix "on-" which means "onto" and the noun "falls" which refers to a sudden drop. The IPA phonetic transcription for "onfalls" is /ɒn.fɔːlz/. The "o" is pronounced as in "hot" and the "a" as in "cat". The "f" is pronounced as in "fan" and the "ls" as in "falls". Overall, the spelling of "onfalls" can be understood by breaking down its prefix and root word.