The word "up holster" is spelled as /ʌp ˈhəʊlstə/. The first syllable "up" is pronounced with the vowel sound /ʌ/ (like the "u" in "cup") and the second syllable "holster" is pronounced with the vowel sound /əʊ/ (like the "o" in "go"). The "l" in "holster" is silent, and the stress is on the second syllable. The word "up holster" refers to the act of placing something in a holster that is worn above the waist.