The spelling of the word "out skull" can be a little tricky due to the combination of the sounds "out" and "skull". The IPA phonetic transcription can help to clarify the proper pronunciation of these sounds. The word "out" is commonly pronounced as /aʊt/ which represents the diphthong of the vowel sounds "ow" and "oo". The word "skull" is pronounced as /skʌl/ with the "u" sound pronounced as "uh" and the "ll" sound representing a single "l" sound.