pall

cast a pall on/over something

if an unpleasant event or piece of news casts a pall on something, it spoils it. News of her sudden death cast a pall on the awards ceremony.

See also: cast, over

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cast a pall over something

to spoil something. Her illness cast a pall over the awards ceremony.

Etymology: from the literal meaning of a pall (= something, such as smoke or fog or dust in the air, that makes the sky dark)

See also: cast, over