The correct spelling of the word is "most picturing", which is pronounced /məʊst ˈpɪk.tʃər.ɪŋ/. The first syllable "most" is pronounced with the long "o" vowel sound /oʊ/, and the second syllable "pic" is pronounced with a short "i" vowel sound /ɪ/. The suffix "-ing" is pronounced with a nasal consonant /ŋ/ and a short "i" vowel sound /ɪ/ as well. "Most picturing" refers to the act of creating a mental image of something, usually using visualization techniques.