The word 'holiday' is a corruption of 'holy day'.

单词holiday是holy day的变体。

《牛津词典》

On December 9, International Anti-Corruption Day, Myanmar missed a timely opportunity to counter its recent ranking when it failed to ratify the U.N.

CNN: Long way to go in Myanmar's battle to reform

It was altogether commendable when, in October 2003, the General Assembly of the United Nations proclaimed December 9 as International Anti-Corruption Day in order to raise awareness of global corruption and how the United Nations Convention against Corruption combats and prevents it.

FORBES: A New Public/Private Sector Partnership Is Poised to Tackle Global Corruption

And even if corruption could one day be cut to, say, Turkish levels, Georgia would still face formidable problems.

ECONOMIST: Edward Shevardnadze, Georgia��s foxy president