The spelling of the word "ACCCOP" can be explained using the International Phonetic Alphabet (IPA). The first letter, "A", is pronounced as /æ/, followed by three consecutive "C"s that represent the sound /k/. The next two letters, "O", are pronounced as /ɔː/, indicating a long open-mid back vowel sound. Finally, the last letter "P" is pronounced as /p/, indicating an unvoiced bilabial stop sound. Therefore, the correct phonetic transcription of the word "ACCCOP" is /ækkɔːp/.