IPA: /ˈpoʊstˌhɒlɪdeɪ/
KK: /ˈpoʊstˌhɑːlɪdeɪ/
Happening after a holiday, especially the holiday season in late December.
Many people experience postholiday blues after the festive season ends.
Postholiday → It is formed from "post-" (meaning after) and "holiday" (from Old English *haligdæg*, meaning holy day). The word "postholiday" refers to the period or events that occur after a holiday.
Think of 'after' ('post-') a 'holy day' ('holiday') — that's what postholiday means.