cast a pall on (something)
To cause a happy occasion to be sad or somber. The headmaster's sudden death really cast a pall on graduation.
cast a pall over (something)
To cause a happy occasion to be sad or somber. The headmaster's sudden death really cast a pall over graduation.
cast a pall upon, to
To spread gloom. A pall was a cloth or cloak thrown over a coffin. By the eighteenth century the term had been transferred to spiritual darkness (“By this dark Pall thrown o’er the silent world,” Edward Young, Night Thoughts, 1742).